641513764 has 6 divisors (see below), whose sum is σ = 1122649094. Its totient is φ = 320756880.

The previous prime is 641513737. The next prime is 641513771. The reversal of 641513764 is 467315146.

It can be written as a sum of positive squares in only one way, i.e., 578787364 + 62726400 = 24058^2 + 7920^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80189217 + ... + 80189224.

Almost surely, 2^641513764 is an apocalyptic number.

It is an amenable number.

641513764 is a deficient number, since it is larger than the sum of its proper divisors (481135330).

641513764 is a wasteful number, since it uses less digits than its factorization.

641513764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160378445 (or 160378443 counting only the distinct ones).

The product of its digits is 60480, while the sum is 37.

The square root of 641513764 is about 25328.1219990745. The cubic root of 641513764 is about 862.4527797155.

The spelling of 641513764 in words is "six hundred forty-one million, five hundred thirteen thousand, seven hundred sixty-four".