66912884 has 24 divisors (see below), whose sum is σ = 124556040. Its totient is φ = 31343616.

The previous prime is 66912877. The next prime is 66912887. The reversal of 66912884 is 48821966.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 35664784 + 31248100 = 5972^2 + 5590^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66912887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13424 + ... + 17720.

It is an arithmetic number, because the mean of its divisors is an integer number (5189835).

Almost surely, 2^66912884 is an apocalyptic number.

It is an amenable number.

66912884 is a deficient number, since it is larger than the sum of its proper divisors (57643156).

66912884 is a wasteful number, since it uses less digits than its factorization.

66912884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4547 (or 4545 counting only the distinct ones).

The product of its digits is 165888, while the sum is 44.

The square root of 66912884 is about 8180.0295842986. The cubic root of 66912884 is about 405.9787009461.

The spelling of 66912884 in words is "sixty-six million, nine hundred twelve thousand, eight hundred eighty-four".