664560444 has 24 divisors (see below), whose sum is σ = 1555700608. Its totient is φ = 220797360.

The previous prime is 664560427. The next prime is 664560451. The reversal of 664560444 is 444065466.

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 a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86512 + ... + 93879.

Almost surely, 2^664560444 is an apocalyptic number.

It is an amenable number.

664560444 is an abundant number, since it is smaller than the sum of its proper divisors (891140164).

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

664560444 is a wasteful number, since it uses less digits than its factorization.

664560444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180705 (or 180703 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 39.

The square root of 664560444 is about 25779.0698823678. The cubic root of 664560444 is about 872.6595167055.

The spelling of 664560444 in words is "six hundred sixty-four million, five hundred sixty thousand, four hundred forty-four".