764121864 has 64 divisors (see below), whose sum is σ = 2128343040. Its totient is φ = 226621760.

The previous prime is 764121857. The next prime is 764121931. The reversal of 764121864 is 468121467.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18384 + ... + 43199.

It is an arithmetic number, because the mean of its divisors is an integer number (33255360).

Almost surely, 2^764121864 is an apocalyptic number.

It is an amenable number.

764121864 is an abundant number, since it is smaller than the sum of its proper divisors (1364221176).

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

764121864 is a wasteful number, since it uses less digits than its factorization.

764121864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61650 (or 61646 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 764121864 is about 27642.7542766635. The cubic root of 764121864 is about 914.2273485714.

The spelling of 764121864 in words is "seven hundred sixty-four million, one hundred twenty-one thousand, eight hundred sixty-four".