641679544 has 16 divisors (see below), whose sum is σ = 1312526520. Its totient is φ = 291672480.

The previous prime is 641679539. The next prime is 641679617. The reversal of 641679544 is 445976146.

It is a junction number, because it is equal to n+sod(n) for n = 641679494 and 641679503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3645819 + ... + 3645994.

Almost surely, 2^641679544 is an apocalyptic number.

It is an amenable number.

641679544 is an abundant number, since it is smaller than the sum of its proper divisors (670846976).

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

641679544 is a wasteful number, since it uses less digits than its factorization.

641679544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7291830 (or 7291826 counting only the distinct ones).

The product of its digits is 725760, while the sum is 46.

The square root of 641679544 is about 25331.3944345747. The cubic root of 641679544 is about 862.5270650052.

The spelling of 641679544 in words is "six hundred forty-one million, six hundred seventy-nine thousand, five hundred forty-four".