215133228 has 18 divisors (see below), whose sum is σ = 543809084. Its totient is φ = 71711064.

The previous prime is 215133227. The next prime is 215133251. The reversal of 215133228 is 822331512.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (215133227) 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 5 ways as a sum of consecutive naturals, for example, 2987926 + ... + 2987997.

Almost surely, 2^215133228 is an apocalyptic number.

It is an amenable number.

215133228 is an abundant number, since it is smaller than the sum of its proper divisors (328675856).

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

215133228 is a wasteful number, since it uses less digits than its factorization.

215133228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5975933 (or 5975928 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 215133228 is about 14667.4206321357. The cubic root of 215133228 is about 599.1963574116.

The spelling of 215133228 in words is "two hundred fifteen million, one hundred thirty-three thousand, two hundred twenty-eight".