66872944 has 20 divisors (see below), whose sum is σ = 129712680. Its totient is φ = 33398720.

The previous prime is 66872941. The next prime is 66872987. The reversal of 66872944 is 44927866.

It is a happy number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 66872894 and 66872903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66872941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17127 + ... + 20665.

It is an arithmetic number, because the mean of its divisors is an integer number (6485634).

Almost surely, 2^66872944 is an apocalyptic number.

It is an amenable number.

66872944 is a deficient number, since it is larger than the sum of its proper divisors (62839736).

66872944 is a wasteful number, since it uses less digits than its factorization.

66872944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4728 (or 4722 counting only the distinct ones).

The product of its digits is 580608, while the sum is 46.

The square root of 66872944 is about 8177.5879084239. The cubic root of 66872944 is about 405.8979092480.

The spelling of 66872944 in words is "sixty-six million, eight hundred seventy-two thousand, nine hundred forty-four".