646359904 has 24 divisors (see below), whose sum is σ = 1293385968. Its totient is φ = 317880960.

The previous prime is 646359881. The next prime is 646359913. The reversal of 646359904 is 409953646.

It is a super-2 number, since 2×646359904² = 835562250997778432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163612 + ... + 167515.

It is an arithmetic number, because the mean of its divisors is an integer number (53891082).

Almost surely, 2^646359904 is an apocalyptic number.

It is an amenable number.

646359904 is an abundant number, since it is smaller than the sum of its proper divisors (647026064).

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

646359904 is a wasteful number, since it uses less digits than its factorization.

646359904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331198 (or 331190 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 46.

The square root of 646359904 is about 25423.6091851649. The cubic root of 646359904 is about 864.6190550843.

The spelling of 646359904 in words is "six hundred forty-six million, three hundred fifty-nine thousand, nine hundred four".