642975320 has 32 divisors (see below), whose sum is σ = 1557979920. Its totient is φ = 237406080.

The previous prime is 642975301. The next prime is 642975323. The reversal of 642975320 is 23579246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642975323) 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, 617726 + ... + 618765.

Almost surely, 2^642975320 is an apocalyptic number.

It is an amenable number.

642975320 is an abundant number, since it is smaller than the sum of its proper divisors (915004600).

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

642975320 is a wasteful number, since it uses less digits than its factorization.

642975320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236515 (or 1236511 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 642975320 is about 25356.9580194470. The cubic root of 642975320 is about 863.1072561717.

The spelling of 642975320 in words is "six hundred forty-two million, nine hundred seventy-five thousand, three hundred twenty".