642896704 has 28 divisors (see below), whose sum is σ = 1278253984. Its totient is φ = 320817024.

The previous prime is 642896699. The next prime is 642896743. The reversal of 642896704 is 407698246.

It is a happy number.

It is a congruent number.

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, 23869 + ... + 43075.

It is an arithmetic number, because the mean of its divisors is an integer number (45651928).

Almost surely, 2^642896704 is an apocalyptic number.

642896704 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

642896704 is a deficient number, since it is larger than the sum of its proper divisors (635357280).

642896704 is a wasteful number, since it uses less digits than its factorization.

642896704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19742 (or 19732 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 46.

The square root of 642896704 is about 25355.4077861114. The cubic root of 642896704 is about 863.0720776282.

The spelling of 642896704 in words is "six hundred forty-two million, eight hundred ninety-six thousand, seven hundred four".