66731272 has 16 divisors (see below), whose sum is σ = 128173500. Its totient is φ = 32551680.

The previous prime is 66731237. The next prime is 66731297. The reversal of 66731272 is 27213766.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 53670276 + 13060996 = 7326^2 + 3614^2 .

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, 101397 + ... + 102052.

Almost surely, 2^66731272 is an apocalyptic number.

It is an amenable number.

66731272 is a deficient number, since it is larger than the sum of its proper divisors (61442228).

66731272 is a wasteful number, since it uses less digits than its factorization.

66731272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203496 (or 203492 counting only the distinct ones).

The product of its digits is 21168, while the sum is 34.

The square root of 66731272 is about 8168.9211037933. The cubic root of 66731272 is about 405.6110716464.

The spelling of 66731272 in words is "sixty-six million, seven hundred thirty-one thousand, two hundred seventy-two".