640825472 has 64 divisors (see below), whose sum is σ = 1544883840. Its totient is φ = 258478080.

The previous prime is 640825469. The next prime is 640825477. The reversal of 640825472 is 274528046.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (640825477) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5804 + ... + 36267.

It is an arithmetic number, because the mean of its divisors is an integer number (24138810).

Almost surely, 2^640825472 is an apocalyptic number.

It is an amenable number.

640825472 is an abundant number, since it is smaller than the sum of its proper divisors (904058368).

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

640825472 is a wasteful number, since it uses less digits than its factorization.

640825472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42109 (or 42097 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 38.

The square root of 640825472 is about 25314.5308469266. The cubic root of 640825472 is about 862.1442221493.

The spelling of 640825472 in words is "six hundred forty million, eight hundred twenty-five thousand, four hundred seventy-two".