65991972 has 48 divisors (see below), whose sum is σ = 158618880. Its totient is φ = 21344928.

The previous prime is 65991953. The next prime is 65992013. The reversal of 65991972 is 27919956.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58203 + ... + 59325.

It is an arithmetic number, because the mean of its divisors is an integer number (3304560).

Almost surely, 2^65991972 is an apocalyptic number.

It is an amenable number.

65991972 is an abundant number, since it is smaller than the sum of its proper divisors (92626908).

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

65991972 is a wasteful number, since it uses less digits than its factorization.

65991972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272 (or 1270 counting only the distinct ones).

The product of its digits is 306180, while the sum is 48.

The square root of 65991972 is about 8123.5443003655. The cubic root of 65991972 is about 404.1076160065.

The spelling of 65991972 in words is "sixty-five million, nine hundred ninety-one thousand, nine hundred seventy-two".