764513668 has 6 divisors (see below), whose sum is σ = 1337898926. Its totient is φ = 382256832.

The previous prime is 764513663. The next prime is 764513693. The reversal of 764513668 is 866315467.

It can be written as a sum of positive squares in only one way, i.e., 649638144 + 114875524 = 25488^2 + 10718^2 .

It is a super-2 number, since 2×764513668² = 1168962297117628448, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (764513663) by changing a digit.

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, 95564205 + ... + 95564212.

Almost surely, 2^764513668 is an apocalyptic number.

It is an amenable number.

764513668 is a deficient number, since it is larger than the sum of its proper divisors (573385258).

764513668 is a wasteful number, since it uses less digits than its factorization.

764513668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191128421 (or 191128419 counting only the distinct ones).

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

The square root of 764513668 is about 27649.8402888697. The cubic root of 764513668 is about 914.3835787681.

The spelling of 764513668 in words is "seven hundred sixty-four million, five hundred thirteen thousand, six hundred sixty-eight".