642931896 has 16 divisors (see below), whose sum is σ = 1607329800. Its totient is φ = 214310624.

The previous prime is 642931889. The next prime is 642931897. The reversal of 642931896 is 698139246.

It is a super-2 number, since 2×642931896² = 826722845788309632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642931897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13394391 + ... + 13394438.

Almost surely, 2^642931896 is an apocalyptic number.

It is an amenable number.

642931896 is an abundant number, since it is smaller than the sum of its proper divisors (964397904).

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

642931896 is a wasteful number, since it uses less digits than its factorization.

642931896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26788838 (or 26788834 counting only the distinct ones).

The product of its digits is 559872, while the sum is 48.

The square root of 642931896 is about 25356.1017508607. The cubic root of 642931896 is about 863.0878254553.

The spelling of 642931896 in words is "six hundred forty-two million, nine hundred thirty-one thousand, eight hundred ninety-six".