66047172 has 24 divisors (see below), whose sum is σ = 154761600. Its totient is φ = 21922656.

The previous prime is 66047161. The next prime is 66047209. The reversal of 66047172 is 27174066.

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, 8647 + ... + 14382.

It is an arithmetic number, because the mean of its divisors is an integer number (6448400).

Almost surely, 2^66047172 is an apocalyptic number.

It is an amenable number.

66047172 is an abundant number, since it is smaller than the sum of its proper divisors (88714428).

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

66047172 is a wasteful number, since it uses less digits than its factorization.

66047172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23275 (or 23273 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 66047172 is about 8126.9411219720. The cubic root of 66047172 is about 404.2202586154.

The spelling of 66047172 in words is "sixty-six million, forty-seven thousand, one hundred seventy-two".