72166860 has 36 divisors (see below), whose sum is σ = 218906688. Its totient is φ = 19244448.

The previous prime is 72166859. The next prime is 72166873. The reversal of 72166860 is 6866127.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 200284 + ... + 200643.

Almost surely, 2^72166860 is an apocalyptic number.

It is an amenable number.

72166860 is an abundant number, since it is smaller than the sum of its proper divisors (146739828).

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

72166860 is a wasteful number, since it uses less digits than its factorization.

72166860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400942 (or 400937 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 72166860 is about 8495.1080040221. The cubic root of 72166860 is about 416.3378896196.

The spelling of 72166860 in words is "seventy-two million, one hundred sixty-six thousand, eight hundred sixty".