65991272 has 16 divisors (see below), whose sum is σ = 124027200. Its totient is φ = 32917360.

The previous prime is 65991271. The next prime is 65991293. The reversal of 65991272 is 27219956.

It is not an unprimeable number, because it can be changed into a prime (65991271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6122 + ... + 13017.

It is an arithmetic number, because the mean of its divisors is an integer number (7751700).

Almost surely, 2^65991272 is an apocalyptic number.

It is an amenable number.

65991272 is a deficient number, since it is larger than the sum of its proper divisors (58035928).

65991272 is a wasteful number, since it uses less digits than its factorization.

65991272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19576 (or 19572 counting only the distinct ones).

The product of its digits is 68040, while the sum is 41.

The square root of 65991272 is about 8123.5012156089. The cubic root of 65991272 is about 404.1061871643.

The spelling of 65991272 in words is "sixty-five million, nine hundred ninety-one thousand, two hundred seventy-two".