764251664 has 20 divisors (see below), whose sum is σ = 1615350480. Its totient is φ = 347387040.

The previous prime is 764251637. The next prime is 764251667. The reversal of 764251664 is 466152467.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (764251667) 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, 2170994 + ... + 2171345.

It is an arithmetic number, because the mean of its divisors is an integer number (80767524).

Almost surely, 2^764251664 is an apocalyptic number.

It is an amenable number.

764251664 is an abundant number, since it is smaller than the sum of its proper divisors (851098816).

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

764251664 is a wasteful number, since it uses less digits than its factorization.

764251664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4342358 (or 4342352 counting only the distinct ones).

The product of its digits is 241920, while the sum is 41.

The square root of 764251664 is about 27645.1019893217. The cubic root of 764251664 is about 914.2791116897.

The spelling of 764251664 in words is "seven hundred sixty-four million, two hundred fifty-one thousand, six hundred sixty-four".