764565985 has 32 divisors (see below), whose sum is σ = 985374720. Its totient is φ = 567806400.

The previous prime is 764565983. The next prime is 764566031. The reversal of 764565985 is 589565467.

764565985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 764565985 - 2¹ = 764565983 is a prime.

It is a super-2 number, since 2×764565985² = 1169122290838040450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (764565983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1773720 + ... + 1774150.

It is an arithmetic number, because the mean of its divisors is an integer number (30792960).

Almost surely, 2^764565985 is an apocalyptic number.

It is an amenable number.

764565985 is a deficient number, since it is larger than the sum of its proper divisors (220808735).

764565985 is a wasteful number, since it uses less digits than its factorization.

764565985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789.

The product of its digits is 9072000, while the sum is 55.

The square root of 764565985 is about 27650.7863360158. The cubic root of 764565985 is about 914.4044359119.

The spelling of 764565985 in words is "seven hundred sixty-four million, five hundred sixty-five thousand, nine hundred eighty-five".