641725056 has 96 divisors (see below), whose sum is σ = 2110461600. Its totient is φ = 183347712.

The previous prime is 641725043. The next prime is 641725099. The reversal of 641725056 is 650527146.

It is a happy number.

641725056 is a `hidden beast` number, since 641 + 7 + 2 + 5 + 0 + 5 + 6 = 666.

641725056 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×641725056² = 823622094996406272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 641725056.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31726 + ... + 47853.

It is an arithmetic number, because the mean of its divisors is an integer number (21983975).

Almost surely, 2^641725056 is an apocalyptic number.

It is an amenable number.

641725056 is an abundant number, since it is smaller than the sum of its proper divisors (1468736544).

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

641725056 is a wasteful number, since it uses less digits than its factorization.

641725056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79606 (or 79591 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 641725056 is about 25332.2927505585. The cubic root of 641725056 is about 862.5474564940.

The spelling of 641725056 in words is "six hundred forty-one million, seven hundred twenty-five thousand, fifty-six".