665072 has 20 divisors (see below), whose sum is σ = 1301256. Its totient is φ = 329280.

The previous prime is 665069. The next prime is 665089. The reversal of 665072 is 270566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3047 + ... + 3257.

2⁶⁶⁵⁰⁷² is an apocalyptic number.

It is an amenable number.

665072 is a deficient number, since it is larger than the sum of its proper divisors (636184).

665072 is a wasteful number, since it uses less digits than its factorization.

665072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416 (or 410 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 665072 is about 815.5194663526. The cubic root of 665072 is about 87.2883373803.

The spelling of 665072 in words is "six hundred sixty-five thousand, seventy-two".