764643836 has 24 divisors (see below), whose sum is σ = 1465852080. Its totient is φ = 346118400.

The previous prime is 764643827. The next prime is 764643853. The reversal of 764643836 is 638346467.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25451 + ... + 46658.

It is an arithmetic number, because the mean of its divisors is an integer number (61077170).

Almost surely, 2^764643836 is an apocalyptic number.

It is an amenable number.

764643836 is a deficient number, since it is larger than the sum of its proper divisors (701208244).

764643836 is a wasteful number, since it uses less digits than its factorization.

764643836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72365 (or 72363 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 47.

The square root of 764643836 is about 27652.1940539987. The cubic root of 764643836 is about 914.4354708978.

The spelling of 764643836 in words is "seven hundred sixty-four million, six hundred forty-three thousand, eight hundred thirty-six".