66746172 has 48 divisors (see below), whose sum is σ = 158578560. Its totient is φ = 21847872.

The previous prime is 66746149. The next prime is 66746179. The reversal of 66746172 is 27164766.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66746172.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66746179) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291354 + ... + 291582.

It is an arithmetic number, because the mean of its divisors is an integer number (3303720).

Almost surely, 2^66746172 is an apocalyptic number.

It is an amenable number.

66746172 is an abundant number, since it is smaller than the sum of its proper divisors (91832388).

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

66746172 is a wasteful number, since it uses less digits than its factorization.

66746172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570 (or 568 counting only the distinct ones).

The product of its digits is 84672, while the sum is 39.

The square root of 66746172 is about 8169.8330460298. The cubic root of 66746172 is about 405.6412581693.

The spelling of 66746172 in words is "sixty-six million, seven hundred forty-six thousand, one hundred seventy-two".