641625776 has 40 divisors (see below), whose sum is σ = 1359883200. Its totient is φ = 290848320.

The previous prime is 641625749. The next prime is 641625799. The reversal of 641625776 is 677526146.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61895 + ... + 71513.

It is an arithmetic number, because the mean of its divisors is an integer number (33997080).

Almost surely, 2^641625776 is an apocalyptic number.

It is an amenable number.

641625776 is an abundant number, since it is smaller than the sum of its proper divisors (718257424).

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

641625776 is a wasteful number, since it uses less digits than its factorization.

641625776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10017 (or 10011 counting only the distinct ones).

The product of its digits is 423360, while the sum is 44.

The square root of 641625776 is about 25330.3331205888. Note that the first 3 decimals coincide. The cubic root of 641625776 is about 862.5029732027.

The spelling of 641625776 in words is "six hundred forty-one million, six hundred twenty-five thousand, seven hundred seventy-six".