666372 has 24 divisors (see below), whose sum is σ = 1777216. Its totient is φ = 190368.

The previous prime is 666353. The next prime is 666403. The reversal of 666372 is 273666.

It is a super-4 number, since 4×666372⁴ (a number of 24 digits) contains 4444 as substring.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

666372 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 7 ways as a sum of consecutive naturals, for example, 3883 + ... + 4050.

2⁶⁶⁶³⁷² is an apocalyptic number.

It is an amenable number.

666372 is an abundant number, since it is smaller than the sum of its proper divisors (1110844).

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

666372 is a wasteful number, since it uses less digits than its factorization.

666372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7947 (or 7945 counting only the distinct ones).

The product of its digits is 9072, while the sum is 30.

The square root of 666372 is about 816.3161152397. The cubic root of 666372 is about 87.3451738247.

The spelling of 666372 in words is "six hundred sixty-six thousand, three hundred seventy-two".