764051985 has 12 divisors (see below), whose sum is σ = 1324356852. Its totient is φ = 407494368.

The previous prime is 764051983. The next prime is 764051989. The reversal of 764051985 is 589150467.

It can be written as a sum of positive squares in 2 ways, for example, as 108743184 + 655308801 = 10428^2 + 25599^2 .

It is not a de Polignac number, because 764051985 - 2¹ = 764051983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 16978933 = 764051985 / (7 + 6 + 4 + 0 + 5 + 1 + 9 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 764051985.

It is not an unprimeable number, because it can be changed into a prime (764051983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8489422 + ... + 8489511.

It is an arithmetic number, because the mean of its divisors is an integer number (110363071).

Almost surely, 2^764051985 is an apocalyptic number.

It is an amenable number.

764051985 is a deficient number, since it is larger than the sum of its proper divisors (560304867).

764051985 is a wasteful number, since it uses less digits than its factorization.

764051985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16978944 (or 16978941 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The square root of 764051985 is about 27641.4902818209. The cubic root of 764051985 is about 914.1994790027.

The spelling of 764051985 in words is "seven hundred sixty-four million, fifty-one thousand, nine hundred eighty-five".