168646228 has 6 divisors (see below), whose sum is σ = 295130906. Its totient is φ = 84323112.

The previous prime is 168646211. The next prime is 168646241. The reversal of 168646228 is 822646861.

It can be written as a sum of positive squares in only one way, i.e., 157703364 + 10942864 = 12558^2 + 3308^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21080775 + ... + 21080782.

Almost surely, 2^168646228 is an apocalyptic number.

It is an amenable number.

168646228 is a deficient number, since it is larger than the sum of its proper divisors (126484678).

168646228 is a wasteful number, since it uses less digits than its factorization.

168646228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42161561 (or 42161559 counting only the distinct ones).

The product of its digits is 221184, while the sum is 43.

The square root of 168646228 is about 12986.3862563840. The cubic root of 168646228 is about 552.4914276974.

The spelling of 168646228 in words is "one hundred sixty-eight million, six hundred forty-six thousand, two hundred twenty-eight".