764540644 has 48 divisors (see below), whose sum is σ = 1559900160. Its totient is φ = 321092640.

The previous prime is 764540629. The next prime is 764540663. The reversal of 764540644 is 446045467.

It is a junction number, because it is equal to n+sod(n) for n = 764540597 and 764540606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 770989 + ... + 771979.

It is an arithmetic number, because the mean of its divisors is an integer number (32497920).

Almost surely, 2^764540644 is an apocalyptic number.

It is an amenable number.

764540644 is an abundant number, since it is smaller than the sum of its proper divisors (795359516).

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

764540644 is a wasteful number, since it uses less digits than its factorization.

764540644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528 (or 1526 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 40.

The square root of 764540644 is about 27650.3280993192. The cubic root of 764540644 is about 914.3943333704.

The spelling of 764540644 in words is "seven hundred sixty-four million, five hundred forty thousand, six hundred forty-four".