668372 has 12 divisors (see below), whose sum is σ = 1238580. Its totient is φ = 314496.

The previous prime is 668347. The next prime is 668407. The reversal of 668372 is 273866.

It can be written as a sum of positive squares in 2 ways, for example, as 568516 + 99856 = 754^2 + 316^2 .

It is a super-2 number, since 2×668372² = 893442260768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

668372 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4847 + ... + 4982.

It is an arithmetic number, because the mean of its divisors is an integer number (103215).

2⁶⁶⁸³⁷² is an apocalyptic number.

It is an amenable number.

668372 is a deficient number, since it is larger than the sum of its proper divisors (570208).

668372 is a wasteful number, since it uses less digits than its factorization.

668372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9850 (or 9848 counting only the distinct ones).

The product of its digits is 12096, while the sum is 32.

The square root of 668372 is about 817.5402130782. The cubic root of 668372 is about 87.4324703452.

The spelling of 668372 in words is "six hundred sixty-eight thousand, three hundred seventy-two".