640884516 has 24 divisors (see below), whose sum is σ = 1574102880. Its totient is φ = 202384512.

The previous prime is 640884509. The next prime is 640884523. The reversal of 640884516 is 615488046.

It is an interprime number because it is at equal distance from previous prime (640884509) and next prime (640884523).

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, 1405221 + ... + 1405676.

It is an arithmetic number, because the mean of its divisors is an integer number (65587620).

Almost surely, 2^640884516 is an apocalyptic number.

It is an amenable number.

640884516 is an abundant number, since it is smaller than the sum of its proper divisors (933218364).

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

640884516 is a wasteful number, since it uses less digits than its factorization.

640884516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2810923 (or 2810921 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 42.

The square root of 640884516 is about 25315.6970277336. The cubic root of 640884516 is about 862.1706999150.

The spelling of 640884516 in words is "six hundred forty million, eight hundred eighty-four thousand, five hundred sixteen".