664702572 has 24 divisors (see below), whose sum is σ = 1553743296. Its totient is φ = 221171728.

The previous prime is 664702541. The next prime is 664702579. The reversal of 664702572 is 275207466.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 664702572.

It is not an unprimeable number, because it can be changed into a prime (664702579) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 42438 + ... + 55949.

It is an arithmetic number, because the mean of its divisors is an integer number (64739304).

Almost surely, 2^664702572 is an apocalyptic number.

It is an amenable number.

664702572 is an abundant number, since it is smaller than the sum of its proper divisors (889040724).

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

664702572 is a wasteful number, since it uses less digits than its factorization.

664702572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98957 (or 98955 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 39.

The square root of 664702572 is about 25781.8263899205. The cubic root of 664702572 is about 872.7217234930.

The spelling of 664702572 in words is "six hundred sixty-four million, seven hundred two thousand, five hundred seventy-two".