180221128 has 16 divisors (see below), whose sum is σ = 340577280. Its totient is φ = 89400528.

The previous prime is 180221087. The next prime is 180221177. The reversal of 180221128 is 821122081.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87676 + ... + 89707.

It is an arithmetic number, because the mean of its divisors is an integer number (21286080).

Almost surely, 2^180221128 is an apocalyptic number.

It is an amenable number.

180221128 is a deficient number, since it is larger than the sum of its proper divisors (160356152).

180221128 is a wasteful number, since it uses less digits than its factorization.

180221128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177516 (or 177512 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 180221128 is about 13424.6462895676. The cubic root of 180221128 is about 564.8527331745.

The spelling of 180221128 in words is "one hundred eighty million, two hundred twenty-one thousand, one hundred twenty-eight".