642595806 has 24 divisors (see below), whose sum is σ = 1392830400. Its totient is φ = 214115616.

The previous prime is 642595799. The next prime is 642595813. The reversal of 642595806 is 608595246.

642595806 is a `hidden beast` number, since 64 + 2 + 5 + 9 + 580 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (642595799) and next prime (642595813).

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, 56595 + ... + 66993.

It is an arithmetic number, because the mean of its divisors is an integer number (58034600).

Almost surely, 2^642595806 is an apocalyptic number.

642595806 is an abundant number, since it is smaller than the sum of its proper divisors (750234594).

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

642595806 is a wasteful number, since it uses less digits than its factorization.

642595806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13840 (or 13837 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The square root of 642595806 is about 25349.4734856565. The cubic root of 642595806 is about 862.9374073737.

The spelling of 642595806 in words is "six hundred forty-two million, five hundred ninety-five thousand, eight hundred six".