621638976 has 56 divisors (see below), whose sum is σ = 1879721920. Its totient is φ = 177610752.

The previous prime is 621638959. The next prime is 621638977. The reversal of 621638976 is 679836126.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621638977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 229921 + ... + 232608.

Almost surely, 2^621638976 is an apocalyptic number.

It is an amenable number.

621638976 is an abundant number, since it is smaller than the sum of its proper divisors (1258082944).

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

621638976 is a wasteful number, since it uses less digits than its factorization.

621638976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462551 (or 462541 counting only the distinct ones).

The product of its digits is 653184, while the sum is 48.

The square root of 621638976 is about 24932.6889043280. The cubic root of 621638976 is about 853.4526124496.

The spelling of 621638976 in words is "six hundred twenty-one million, six hundred thirty-eight thousand, nine hundred seventy-six".