642863792 has 20 divisors (see below), whose sum is σ = 1246211160. Its totient is φ = 321260928.

The previous prime is 642863783. The next prime is 642863827. The reversal of 642863792 is 297368246.

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, 23684 + ... + 42972.

It is an arithmetic number, because the mean of its divisors is an integer number (62310558).

Almost surely, 2^642863792 is an apocalyptic number.

It is an amenable number.

642863792 is a deficient number, since it is larger than the sum of its proper divisors (603347368).

642863792 is a wasteful number, since it uses less digits than its factorization.

642863792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21380 (or 21374 counting only the distinct ones).

The product of its digits is 870912, while the sum is 47.

The square root of 642863792 is about 25354.7587643819. The cubic root of 642863792 is about 863.0573495427.

The spelling of 642863792 in words is "six hundred forty-two million, eight hundred sixty-three thousand, seven hundred ninety-two".