764044644 has 48 divisors (see below), whose sum is σ = 2047207680. Its totient is φ = 219342240.

The previous prime is 764044637. The next prime is 764044649. The reversal of 764044644 is 446440467.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (764044649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149814 + ... + 154829.

It is an arithmetic number, because the mean of its divisors is an integer number (42650160).

Almost surely, 2^764044644 is an apocalyptic number.

It is an amenable number.

764044644 is an abundant number, since it is smaller than the sum of its proper divisors (1283163036).

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

764044644 is a wasteful number, since it uses less digits than its factorization.

764044644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304680 (or 304678 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 39.

The square root of 764044644 is about 27641.3574919902. The cubic root of 764044644 is about 914.1965511217.

The spelling of 764044644 in words is "seven hundred sixty-four million, forty-four thousand, six hundred forty-four".