764617220 has 24 divisors (see below), whose sum is σ = 1635994584. Its totient is φ = 300075776.

The previous prime is 764617207. The next prime is 764617229. The reversal of 764617220 is 22716467.

It can be written as a sum of positive squares in 4 ways, for example, as 103510276 + 661106944 = 10174^2 + 25712^2 .

It is not an unprimeable number, because it can be changed into a prime (764617229) 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 7 ways as a sum of consecutive naturals, for example, 359609 + ... + 361728.

It is an arithmetic number, because the mean of its divisors is an integer number (68166441).

Almost surely, 2^764617220 is an apocalyptic number.

It is an amenable number.

764617220 is an abundant number, since it is smaller than the sum of its proper divisors (871377364).

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

764617220 is a wasteful number, since it uses less digits than its factorization.

764617220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721399 (or 721397 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 764617220 is about 27651.7127860102. The cubic root of 764617220 is about 914.4248607742.

The spelling of 764617220 in words is "seven hundred sixty-four million, six hundred seventeen thousand, two hundred twenty".