640124016 has 40 divisors (see below), whose sum is σ = 1889890944. Its totient is φ = 182892480.

The previous prime is 640123987. The next prime is 640124029. The reversal of 640124016 is 610421046.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 952230 + ... + 952901.

Almost surely, 2^640124016 is an apocalyptic number.

It is an amenable number.

640124016 is an abundant number, since it is smaller than the sum of its proper divisors (1249766928).

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

640124016 is a wasteful number, since it uses less digits than its factorization.

640124016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1905149 (or 1905143 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 640124016 is about 25300.6722440334. The cubic root of 640124016 is about 861.8295358287.

The spelling of 640124016 in words is "six hundred forty million, one hundred twenty-four thousand, sixteen".