640758712 has 32 divisors (see below), whose sum is σ = 1355842800. Its totient is φ = 281209600.

The previous prime is 640758667. The next prime is 640758731. The reversal of 640758712 is 217857046.

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, 122989 + ... + 128092.

Almost surely, 2^640758712 is an apocalyptic number.

It is an amenable number.

640758712 is an abundant number, since it is smaller than the sum of its proper divisors (715084088).

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

640758712 is a wasteful number, since it uses less digits than its factorization.

640758712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251127 (or 251123 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 640758712 is about 25313.2122023263. The cubic root of 640758712 is about 862.1142822517.

The spelling of 640758712 in words is "six hundred forty million, seven hundred fifty-eight thousand, seven hundred twelve".