764721536 has 16 divisors (see below), whose sum is σ = 1523468940. Its totient is φ = 382360704.

The previous prime is 764721527. The next prime is 764721563. The reversal of 764721536 is 635127467.

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

It is a junction number, because it is equal to n+sod(n) for n = 764721493 and 764721502.

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, 2987066 + ... + 2987321.

Almost surely, 2^764721536 is an apocalyptic number.

It is an amenable number.

764721536 is a deficient number, since it is larger than the sum of its proper divisors (758747404).

764721536 is an equidigital number, since it uses as much as digits as its factorization.

764721536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5974401 (or 5974389 counting only the distinct ones).

The product of its digits is 211680, while the sum is 41.

The square root of 764721536 is about 27653.5989701160. The cubic root of 764721536 is about 914.4664435879.

The spelling of 764721536 in words is "seven hundred sixty-four million, seven hundred twenty-one thousand, five hundred thirty-six".