642315620 has 24 divisors (see below), whose sum is σ = 1352635200. Its totient is φ = 256207712.

The previous prime is 642315613. The next prime is 642315631. The reversal of 642315620 is 26513246.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37550 + ... + 51909.

It is an arithmetic number, because the mean of its divisors is an integer number (56359800).

Almost surely, 2^642315620 is an apocalyptic number.

It is an amenable number.

642315620 is an abundant number, since it is smaller than the sum of its proper divisors (710319580).

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

642315620 is a wasteful number, since it uses less digits than its factorization.

642315620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89827 (or 89825 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 642315620 is about 25343.9464172413. The cubic root of 642315620 is about 862.8119692017.

Adding to 642315620 its reverse (26513246), we get a palindrome (668828866).

The spelling of 642315620 in words is "six hundred forty-two million, three hundred fifteen thousand, six hundred twenty".