644462046 has 12 divisors (see below), whose sum is σ = 1396334472. Its totient is φ = 214820676.

The previous prime is 644462029. The next prime is 644462051. The reversal of 644462046 is 640264446.

It is a happy number.

644462046 is a `hidden beast` number, since 6 + 4 + 446 + 204 + 6 = 666.

It is a super-2 number, since 2×644462046² = 830662657469012232, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 644462046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17901706 + ... + 17901741.

It is an arithmetic number, because the mean of its divisors is an integer number (116361206).

Almost surely, 2^644462046 is an apocalyptic number.

644462046 is an abundant number, since it is smaller than the sum of its proper divisors (751872426).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

644462046 is a wasteful number, since it uses less digits than its factorization.

644462046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35803455 (or 35803452 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

The square root of 644462046 is about 25386.2570301334. The cubic root of 644462046 is about 863.7719868353.

The spelling of 644462046 in words is "six hundred forty-four million, four hundred sixty-two thousand, forty-six".