66443972 has 12 divisors (see below), whose sum is σ = 132888000. Its totient is φ = 28475976.

The previous prime is 66443957. The next prime is 66443981. The reversal of 66443972 is 27934466.

66443972 is an admirable number.

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, 1186472 + ... + 1186527.

It is an arithmetic number, because the mean of its divisors is an integer number (11074000).

Almost surely, 2^66443972 is an apocalyptic number.

It is an amenable number.

66443972 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66443972 is a wasteful number, since it uses less digits than its factorization.

66443972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2373010 (or 2373008 counting only the distinct ones).

The product of its digits is 217728, while the sum is 41.

The square root of 66443972 is about 8151.3171941717. The cubic root of 66443972 is about 405.0281380643.

The spelling of 66443972 in words is "sixty-six million, four hundred forty-three thousand, nine hundred seventy-two".