640055472 has 80 divisors (see below), whose sum is σ = 1913687040. Its totient is φ = 180550656.

The previous prime is 640055467. The next prime is 640055497. The reversal of 640055472 is 274550046.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 14488 + ... + 38600.

It is an arithmetic number, because the mean of its divisors is an integer number (23921088).

Almost surely, 2^640055472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640055472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (956843520).

640055472 is an abundant number, since it is smaller than the sum of its proper divisors (1273631568).

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

640055472 is a wasteful number, since it uses less digits than its factorization.

640055472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24210 (or 24204 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 33.

The square root of 640055472 is about 25299.3176192561. The cubic root of 640055472 is about 861.7987733770.

The spelling of 640055472 in words is "six hundred forty million, fifty-five thousand, four hundred seventy-two".