640371216 has 40 divisors (see below), whose sum is σ = 1707660544. Its totient is φ = 206570880.

The previous prime is 640371161. The next prime is 640371227. The reversal of 640371216 is 612173046.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213691 + ... + 216666.

Almost surely, 2^640371216 is an apocalyptic number.

It is an amenable number.

640371216 is an abundant number, since it is smaller than the sum of its proper divisors (1067289328).

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

640371216 is a wasteful number, since it uses less digits than its factorization.

640371216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430399 (or 430393 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 640371216 is about 25305.5570181729. The cubic root of 640371216 is about 861.9404606066.

The spelling of 640371216 in words is "six hundred forty million, three hundred seventy-one thousand, two hundred sixteen".