642316628 has 12 divisors (see below), whose sum is σ = 1150195200. Its totient is φ = 313689432.

The previous prime is 642316601. The next prime is 642316639. The reversal of 642316628 is 826613246.

It is a junction number, because it is equal to n+sod(n) for n = 642316591 and 642316600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1867028 + ... + 1867371.

It is an arithmetic number, because the mean of its divisors is an integer number (95849600).

Almost surely, 2^642316628 is an apocalyptic number.

It is an amenable number.

642316628 is a deficient number, since it is larger than the sum of its proper divisors (507878572).

642316628 is a wasteful number, since it uses less digits than its factorization.

642316628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3734446 (or 3734444 counting only the distinct ones).

The product of its digits is 82944, while the sum is 38.

The square root of 642316628 is about 25343.9663036392. The cubic root of 642316628 is about 862.8124205447.

The spelling of 642316628 in words is "six hundred forty-two million, three hundred sixteen thousand, six hundred twenty-eight".