640456012 has 12 divisors (see below), whose sum is σ = 1280912080. Its totient is φ = 274481136.

The previous prime is 640455973. The next prime is 640456013. The reversal of 640456012 is 210654046.

640456012 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 22873429 = 640456012 / (6 + 4 + 0 + 4 + 5 + 6 + 0 + 1 + 2).

It is not an unprimeable number, because it can be changed into a prime (640456013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11436687 + ... + 11436742.

Almost surely, 2^640456012 is an apocalyptic number.

It is an amenable number.

640456012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

640456012 is a wasteful number, since it uses less digits than its factorization.

640456012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22873440 (or 22873438 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 640456012 is about 25307.2324049865. The cubic root of 640456012 is about 861.9785041016.

The spelling of 640456012 in words is "six hundred forty million, four hundred fifty-six thousand, twelve".