180820228 has 24 divisors (see below), whose sum is σ = 335475000. Its totient is φ = 84983808.

The previous prime is 180820223. The next prime is 180820243. The reversal of 180820228 is 822028081.

It can be written as a sum of positive squares in 4 ways, for example, as 23116864 + 157703364 = 4808^2 + 12558^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 180820228.

It is not an unprimeable number, because it can be changed into a prime (180820223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83868 + ... + 85996.

It is an arithmetic number, because the mean of its divisors is an integer number (13978125).

Almost surely, 2^180820228 is an apocalyptic number.

It is an amenable number.

180820228 is a deficient number, since it is larger than the sum of its proper divisors (154654772).

180820228 is a wasteful number, since it uses less digits than its factorization.

180820228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3399 (or 3397 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 180820228 is about 13446.9412135251. The cubic root of 180820228 is about 565.4779447099.

The spelling of 180820228 in words is "one hundred eighty million, eight hundred twenty thousand, two hundred twenty-eight".