640556022 has 16 divisors (see below), whose sum is σ = 1356471792. Its totient is φ = 200958720.

The previous prime is 640556009. The next prime is 640556027. The reversal of 640556022 is 220655046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640556027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3139879 + ... + 3140082.

It is an arithmetic number, because the mean of its divisors is an integer number (84779487).

Almost surely, 2^640556022 is an apocalyptic number.

640556022 is an abundant number, since it is smaller than the sum of its proper divisors (715915770).

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

640556022 is a wasteful number, since it uses less digits than its factorization.

640556022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6279983.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 640556022 is about 25309.2082452217. The cubic root of 640556022 is about 862.0233690009.

The spelling of 640556022 in words is "six hundred forty million, five hundred fifty-six thousand, twenty-two".