161667228 has 24 divisors (see below), whose sum is σ = 390232080. Its totient is φ = 52030720.

The previous prime is 161667227. The next prime is 161667239. The reversal of 161667228 is 822766161.

161667228 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161667228² = 52272585218407968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161667221) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 231933 + ... + 232628.

It is an arithmetic number, because the mean of its divisors is an integer number (16259670).

Almost surely, 2^161667228 is an apocalyptic number.

It is an amenable number.

161667228 is an abundant number, since it is smaller than the sum of its proper divisors (228564852).

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

161667228 is a wasteful number, since it uses less digits than its factorization.

161667228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464597 (or 464595 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

The square root of 161667228 is about 12714.8428224654. The cubic root of 161667228 is about 544.7626584880.

The spelling of 161667228 in words is "one hundred sixty-one million, six hundred sixty-seven thousand, two hundred twenty-eight".