764257664 has 16 divisors (see below), whose sum is σ = 1522544820. Its totient is φ = 382128768.

The previous prime is 764257603. The next prime is 764257687. The reversal of 764257664 is 466752467.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

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 as a sum of consecutive naturals, namely, 2985254 + ... + 2985509.

Almost surely, 2^764257664 is an apocalyptic number.

It is an amenable number.

764257664 is a deficient number, since it is larger than the sum of its proper divisors (758287156).

764257664 is an equidigital number, since it uses as much as digits as its factorization.

764257664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5970777 (or 5970765 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 47.

The square root of 764257664 is about 27645.2105074279. The cubic root of 764257664 is about 914.2815042961.

The spelling of 764257664 in words is "seven hundred sixty-four million, two hundred fifty-seven thousand, six hundred sixty-four".