215768228 has 12 divisors (see below), whose sum is σ = 406640220. Its totient is φ = 99585312.

The previous prime is 215768213. The next prime is 215768239. The reversal of 215768228 is 822867512.

215768228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 60964864 + 154803364 = 7808^2 + 12442^2 .

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, 2074643 + ... + 2074746.

It is an arithmetic number, because the mean of its divisors is an integer number (33886685).

Almost surely, 2^215768228 is an apocalyptic number.

It is an amenable number.

215768228 is a deficient number, since it is larger than the sum of its proper divisors (190871992).

215768228 is a wasteful number, since it uses less digits than its factorization.

215768228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4149406 (or 4149404 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The square root of 215768228 is about 14689.0512967993. The cubic root of 215768228 is about 599.7853194926.

The spelling of 215768228 in words is "two hundred fifteen million, seven hundred sixty-eight thousand, two hundred twenty-eight".