66972972 has 24 divisors (see below), whose sum is σ = 170476992. Its totient is φ = 20294800.

The previous prime is 66972959. The next prime is 66972991. The reversal of 66972972 is 27927966.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253554 + ... + 253817.

It is an arithmetic number, because the mean of its divisors is an integer number (7103208).

Almost surely, 2^66972972 is an apocalyptic number.

It is an amenable number.

66972972 is an abundant number, since it is smaller than the sum of its proper divisors (103504020).

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

66972972 is a wasteful number, since it uses less digits than its factorization.

66972972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507389 (or 507387 counting only the distinct ones).

The product of its digits is 571536, while the sum is 48.

The square root of 66972972 is about 8183.7016074635. The cubic root of 66972972 is about 406.1001880114.

It can be divided in two parts, 6697 and 2972, that added together give a palindrome (9669).

The spelling of 66972972 in words is "sixty-six million, nine hundred seventy-two thousand, nine hundred seventy-two".