642931630 has 64 divisors (see below), whose sum is σ = 1312174080. Its totient is φ = 224697600.

The previous prime is 642931621. The next prime is 642931669. The reversal of 642931630 is 36139246.

It is a happy number.

It is a super-2 number, since 2×642931630² = 826722161708913800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 568906 + ... + 570034.

It is an arithmetic number, because the mean of its divisors is an integer number (20502720).

Almost surely, 2^642931630 is an apocalyptic number.

642931630 is an abundant number, since it is smaller than the sum of its proper divisors (669242450).

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

642931630 is a wasteful number, since it uses less digits than its factorization.

642931630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 642931630 is about 25356.0965055744. The cubic root of 642931630 is about 863.0877064269.

The spelling of 642931630 in words is "six hundred forty-two million, nine hundred thirty-one thousand, six hundred thirty".