641765936 has 30 divisors (see below), whose sum is σ = 1446430860. Its totient is φ = 275042208.

The previous prime is 641765899. The next prime is 641765981. The reversal of 641765936 is 639567146.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 408506 + ... + 410073.

It is an arithmetic number, because the mean of its divisors is an integer number (48214362).

Almost surely, 2^641765936 is an apocalyptic number.

It is an amenable number.

641765936 is an abundant number, since it is smaller than the sum of its proper divisors (804664924).

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

641765936 is a wasteful number, since it uses less digits than its factorization.

641765936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818601 (or 818588 counting only the distinct ones).

The product of its digits is 816480, while the sum is 47.

The square root of 641765936 is about 25333.0996129570. The cubic root of 641765936 is about 862.5657718099.

The spelling of 641765936 in words is "six hundred forty-one million, seven hundred sixty-five thousand, nine hundred thirty-six".