664846772 has 24 divisors (see below), whose sum is σ = 1191335040. Its totient is φ = 324502400.

The previous prime is 664846771. The next prime is 664846807. The reversal of 664846772 is 277648466.

It is a self number, because there is not a number n which added to its sum of digits gives 664846772.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664846771) 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 7 ways as a sum of consecutive naturals, for example, 70979 + ... + 79797.

It is an arithmetic number, because the mean of its divisors is an integer number (49638960).

Almost surely, 2^664846772 is an apocalyptic number.

It is an amenable number.

664846772 is a deficient number, since it is larger than the sum of its proper divisors (526488268).

664846772 is a wasteful number, since it uses less digits than its factorization.

664846772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9271 (or 9269 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 50.

The square root of 664846772 is about 25784.6227818054. The cubic root of 664846772 is about 872.7848280947.

The spelling of 664846772 in words is "six hundred sixty-four million, eight hundred forty-six thousand, seven hundred seventy-two".