640762124 has 12 divisors (see below), whose sum is σ = 1125988248. Its totient is φ = 319051200.

The previous prime is 640762069. The next prime is 640762151. The reversal of 640762124 is 421267046.

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, 331382 + ... + 333309.

It is an arithmetic number, because the mean of its divisors is an integer number (93832354).

Almost surely, 2^640762124 is an apocalyptic number.

It is an amenable number.

640762124 is a deficient number, since it is larger than the sum of its proper divisors (485226124).

640762124 is a wasteful number, since it uses less digits than its factorization.

640762124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664936 (or 664934 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 640762124 is about 25313.2795978712. The cubic root of 640762124 is about 862.1158124838.

The spelling of 640762124 in words is "six hundred forty million, seven hundred sixty-two thousand, one hundred twenty-four".