667972 has 12 divisors (see below), whose sum is σ = 1197756. Its totient is φ = 325760.

The previous prime is 667963. The next prime is 667987. The reversal of 667972 is 279766.

It can be written as a sum of positive squares in 2 ways, for example, as 50176 + 617796 = 224^2 + 786^2 .

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, 1873 + ... + 2200.

It is an arithmetic number, because the mean of its divisors is an integer number (99813).

2⁶⁶⁷⁹⁷² is an apocalyptic number.

It is an amenable number.

667972 is a deficient number, since it is larger than the sum of its proper divisors (529784).

667972 is a wasteful number, since it uses less digits than its factorization.

667972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4118 (or 4116 counting only the distinct ones).

The product of its digits is 31752, while the sum is 37.

The square root of 667972 is about 817.2955401812. The cubic root of 667972 is about 87.4150249868.

The spelling of 667972 in words is "six hundred sixty-seven thousand, nine hundred seventy-two".