66172884 has 24 divisors (see below), whose sum is σ = 154586208. Its totient is φ = 22031520.

The previous prime is 66172753. The next prime is 66172907. The reversal of 66172884 is 48827166.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9199 + ... + 14729.

It is an arithmetic number, because the mean of its divisors is an integer number (6441092).

Almost surely, 2^66172884 is an apocalyptic number.

It is an amenable number.

66172884 is an abundant number, since it is smaller than the sum of its proper divisors (88413324).

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

66172884 is a wasteful number, since it uses less digits than its factorization.

66172884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6535 (or 6533 counting only the distinct ones).

The product of its digits is 129024, while the sum is 42.

The square root of 66172884 is about 8134.6717204814. The cubic root of 66172884 is about 404.4765558930.

The spelling of 66172884 in words is "sixty-six million, one hundred seventy-two thousand, eight hundred eighty-four".