72166660 has 48 divisors (see below), whose sum is σ = 155458800. Its totient is φ = 28131840.

The previous prime is 72166657. The next prime is 72166673. The reversal of 72166660 is 6666127.

It can be written as a sum of positive squares in 8 ways, for example, as 16842816 + 55323844 = 4104^2 + 7438^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181582 + ... + 181978.

It is an arithmetic number, because the mean of its divisors is an integer number (3238725).

Almost surely, 2^72166660 is an apocalyptic number.

It is an amenable number.

72166660 is an abundant number, since it is smaller than the sum of its proper divisors (83292140).

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

72166660 is a wasteful number, since it uses less digits than its factorization.

72166660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616 (or 614 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 72166660 is about 8495.0962325332. The cubic root of 72166660 is about 416.3375050125.

The spelling of 72166660 in words is "seventy-two million, one hundred sixty-six thousand, six hundred sixty".