660772 has 12 divisors (see below), whose sum is σ = 1321600. Its totient is φ = 283176.

The previous prime is 660769. The next prime is 660787. The reversal of 660772 is 277066.

660772 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 23599 = 660772 / (6 + 6 + 0 + 7 + 7 + 2).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 660772.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11772 + ... + 11827.

2⁶⁶⁰⁷⁷² is an apocalyptic number.

It is an amenable number.

660772 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

660772 is a wasteful number, since it uses less digits than its factorization.

660772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23610 (or 23608 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 660772 is about 812.8788347595. The cubic root of 660772 is about 87.0998105819.

The spelling of 660772 in words is "six hundred sixty thousand, seven hundred seventy-two".