640292416 has 21 divisors (see below), whose sum is σ = 1270982091. Its totient is φ = 320044992.

The previous prime is 640292399. The next prime is 640292431. The reversal of 640292416 is 614292046.

The square root of 640292416 is 25304.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 200851 + ... + 204013.

Almost surely, 2^640292416 is an apocalyptic number.

640292416 is the 25304-th square number.

It is an amenable number.

640292416 is a deficient number, since it is larger than the sum of its proper divisors (630689675).

640292416 is an frugal number, since it uses more digits than its factorization.

640292416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6338 (or 3165 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The cubic root of 640292416 is about 861.9051041900.

Multiplying 640292416 by its product of nonzero digits (20736), we get a square (13277103538176 = 3643776²).

The spelling of 640292416 in words is "six hundred forty million, two hundred ninety-two thousand, four hundred sixteen".