642868692 has 24 divisors (see below), whose sum is σ = 1508702496. Its totient is φ = 213050208.

The previous prime is 642868687. The next prime is 642868703. The reversal of 642868692 is 296868246.

It is a congruent number.

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, 152758 + ... + 156909.

It is an arithmetic number, because the mean of its divisors is an integer number (62862604).

Almost surely, 2^642868692 is an apocalyptic number.

It is an amenable number.

642868692 is an abundant number, since it is smaller than the sum of its proper divisors (865833804).

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

642868692 is a wasteful number, since it uses less digits than its factorization.

642868692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309847 (or 309845 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 51.

The square root of 642868692 is about 25354.8553930012. The cubic root of 642868692 is about 863.0595423194.

The spelling of 642868692 in words is "six hundred forty-two million, eight hundred sixty-eight thousand, six hundred ninety-two".