66931272 has 40 divisors (see below), whose sum is σ = 187471350. Its totient is φ = 22310208.

The previous prime is 66931259. The next prime is 66931273. The reversal of 66931272 is 27213966.

It can be written as a sum of positive squares in only one way, i.e., 66487716 + 443556 = 8154^2 + 666^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (66931273) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 50997 + ... + 52292.

Almost surely, 2^66931272 is an apocalyptic number.

It is an amenable number.

66931272 is an abundant number, since it is smaller than the sum of its proper divisors (120540078).

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

66931272 is a wasteful number, since it uses less digits than its factorization.

66931272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103307 (or 103294 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 66931272 is about 8181.1534639072. The cubic root of 66931272 is about 406.0158858757.

The spelling of 66931272 in words is "sixty-six million, nine hundred thirty-one thousand, two hundred seventy-two".