764916660 has 36 divisors (see below), whose sum is σ = 2320247748. Its totient is φ = 203977728.

The previous prime is 764916653. The next prime is 764916667. The reversal of 764916660 is 66619467.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (764916653) and next prime (764916667).

It can be written as a sum of positive squares in 2 ways, for example, as 83393424 + 681523236 = 9132^2 + 26106^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (764916667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2124589 + ... + 2124948.

Almost surely, 2^764916660 is an apocalyptic number.

It is an amenable number.

764916660 is an abundant number, since it is smaller than the sum of its proper divisors (1555331088).

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

764916660 is a wasteful number, since it uses less digits than its factorization.

764916660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4249552 (or 4249547 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 764916660 is about 27657.1267488147. The cubic root of 764916660 is about 914.5442144573.

The spelling of 764916660 in words is "seven hundred sixty-four million, nine hundred sixteen thousand, six hundred sixty".