621970904 has 8 divisors (see below), whose sum is σ = 1166195460. Its totient is φ = 310985448.

The previous prime is 621970903. The next prime is 621970957. The reversal of 621970904 is 409079126.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621970903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38873174 + ... + 38873189.

Almost surely, 2^621970904 is an apocalyptic number.

It is an amenable number.

621970904 is a deficient number, since it is larger than the sum of its proper divisors (544224556).

621970904 is a wasteful number, since it uses less digits than its factorization.

621970904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77746369 (or 77746365 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 621970904 is about 24939.3444982020. The cubic root of 621970904 is about 853.6044875326.

The spelling of 621970904 in words is "six hundred twenty-one million, nine hundred seventy thousand, nine hundred four".