642330864 has 80 divisors (see below), whose sum is σ = 2107127040. Its totient is φ = 183522240.

The previous prime is 642330781. The next prime is 642330877. The reversal of 642330864 is 468033246.

It is a happy number.

642330864 is a `hidden beast` number, since 642 + 3 + 3 + 0 + 8 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103182 + ... + 109229.

It is an arithmetic number, because the mean of its divisors is an integer number (26339088).

Almost surely, 2^642330864 is an apocalyptic number.

It is an amenable number.

642330864 is an abundant number, since it is smaller than the sum of its proper divisors (1464796176).

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

642330864 is a wasteful number, since it uses less digits than its factorization.

642330864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212435 (or 212423 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 642330864 is about 25344.2471578858. The cubic root of 642330864 is about 862.8187948188.

The spelling of 642330864 in words is "six hundred forty-two million, three hundred thirty thousand, eight hundred sixty-four".