642767870 has 24 divisors (see below), whose sum is σ = 1184548536. Its totient is φ = 251120688.

The previous prime is 642767863. The next prime is 642767887. The reversal of 642767870 is 78767246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1109 + ... + 35871.

It is an arithmetic number, because the mean of its divisors is an integer number (49356189).

Almost surely, 2^642767870 is an apocalyptic number.

642767870 is a deficient number, since it is larger than the sum of its proper divisors (541780666).

642767870 is a wasteful number, since it uses less digits than its factorization.

642767870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34856 (or 34813 counting only the distinct ones).

The product of its (nonzero) digits is 790272, while the sum is 47.

The square root of 642767870 is about 25352.8670962477. The cubic root of 642767870 is about 863.0144216804.

The spelling of 642767870 in words is "six hundred forty-two million, seven hundred sixty-seven thousand, eight hundred seventy".