764219856 has 20 divisors (see below), whose sum is σ = 1974234752. Its totient is φ = 254739936.

The previous prime is 764219849. The next prime is 764219857. The reversal of 764219856 is 658912467.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 15921247 = 764219856 / (7 + 6 + 4 + 2 + 1 + 9 + 8 + 5 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (764219857) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 7960576 + ... + 7960671.

Almost surely, 2^764219856 is an apocalyptic number.

It is an amenable number.

764219856 is an abundant number, since it is smaller than the sum of its proper divisors (1210014896).

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

764219856 is a wasteful number, since it uses less digits than its factorization.

764219856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15921258 (or 15921252 counting only the distinct ones).

The product of its digits is 725760, while the sum is 48.

The square root of 764219856 is about 27644.5266915532. The cubic root of 764219856 is about 914.2664274763.

The spelling of 764219856 in words is "seven hundred sixty-four million, two hundred nineteen thousand, eight hundred fifty-six".