Closest hex to #634634 is #643

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#
#643

634634

634634

contains 64

064 164 264 364 464 564 640 641 642 643 644 645 646 647 648 649 64a 64b 64c 64d 64e 64f 664 764 864 964 a64 b64 c64 d64 e64 f64

contains 43

043 143 243 343 430 431 432 433 434 435 436 437 438 439 43a 43b 43c 43d 43e 43f 443 543 643 743 843 943 a43 b43 c43 d43 e43 f43

contains 63

063 163 263 363 463 563 630 631 632 633 634 635 636 637 638 639 63a 63b 63c 63d 63e 63f 663 763 863 963 a63 b63 c63 d63 e63 f63