641625764 has 48 divisors (see below), whose sum is σ = 1307674368. Its totient is φ = 272767488.

The previous prime is 641625749. The next prime is 641625799. The reversal of 641625764 is 467526146.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33827 + ... + 49269.

It is an arithmetic number, because the mean of its divisors is an integer number (27243216).

Almost surely, 2^641625764 is an apocalyptic number.

It is an amenable number.

641625764 is an abundant number, since it is smaller than the sum of its proper divisors (666048604).

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

641625764 is a wasteful number, since it uses less digits than its factorization.

641625764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15524 (or 15522 counting only the distinct ones).

The product of its digits is 241920, while the sum is 41.

The square root of 641625764 is about 25330.3328837187. The cubic root of 641625764 is about 862.5029678257.

The spelling of 641625764 in words is "six hundred forty-one million, six hundred twenty-five thousand, seven hundred sixty-four".