66490172 has 12 divisors (see below), whose sum is σ = 132980400. Its totient is φ = 28495776.

The previous prime is 66490163. The next prime is 66490187. The reversal of 66490172 is 27109466.

66490172 is an admirable number.

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 3 ways as a sum of consecutive naturals, for example, 1187297 + ... + 1187352.

It is an arithmetic number, because the mean of its divisors is an integer number (11081700).

Almost surely, 2^66490172 is an apocalyptic number.

It is an amenable number.

66490172 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.

66490172 is a wasteful number, since it uses less digits than its factorization.

66490172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2374660 (or 2374658 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 66490172 is about 8154.1505995413. The cubic root of 66490172 is about 405.1219913970.

The spelling of 66490172 in words is "sixty-six million, four hundred ninety thousand, one hundred seventy-two".