764266640 has 40 divisors (see below), whose sum is σ = 1870445760. Its totient is φ = 289616256.

The previous prime is 764266627. The next prime is 764266669. The reversal of 764266640 is 46662467.

It is a tau number, because it is divible by the number of its divisors (40).

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 7 ways as a sum of consecutive naturals, for example, 249884 + ... + 252923.

It is an arithmetic number, because the mean of its divisors is an integer number (46761144).

Almost surely, 2^764266640 is an apocalyptic number.

It is an amenable number.

764266640 is an abundant number, since it is smaller than the sum of its proper divisors (1106179120).

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

764266640 is a wasteful number, since it uses less digits than its factorization.

764266640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502839 (or 502833 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 41.

The square root of 764266640 is about 27645.3728497194. The cubic root of 764266640 is about 914.2850836119.

The spelling of 764266640 in words is "seven hundred sixty-four million, two hundred sixty-six thousand, six hundred forty".