664511764 has 24 divisors (see below), whose sum is σ = 1361441088. Its totient is φ = 277844160.

The previous prime is 664511747. The next prime is 664511767. The reversal of 664511764 is 467115466.

664511764 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664511767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288274 + ... + 290569.

It is an arithmetic number, because the mean of its divisors is an integer number (56726712).

Almost surely, 2^664511764 is an apocalyptic number.

It is an amenable number.

664511764 is an abundant number, since it is smaller than the sum of its proper divisors (696929324).

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

664511764 is a wasteful number, since it uses less digits than its factorization.

664511764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578895 (or 578893 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The square root of 664511764 is about 25778.1256882652. The cubic root of 664511764 is about 872.6382083340.

The spelling of 664511764 in words is "six hundred sixty-four million, five hundred eleven thousand, seven hundred sixty-four".