27993228 has 24 divisors (see below), whose sum is σ = 65556288. Its totient is φ = 9296976.

The previous prime is 27993223. The next prime is 27993263. The reversal of 27993228 is 82239972.

It is a self number, because there is not a number n which added to its sum of digits gives 27993228.

It is not an unprimeable number, because it can be changed into a prime (27993223) 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, 726 + ... + 7517.

It is an arithmetic number, because the mean of its divisors is an integer number (2731512).

Almost surely, 2^27993228 is an apocalyptic number.

It is an amenable number.

27993228 is an abundant number, since it is smaller than the sum of its proper divisors (37563060).

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

27993228 is a wasteful number, since it uses less digits than its factorization.

27993228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8533 (or 8531 counting only the distinct ones).

The product of its digits is 108864, while the sum is 42.

The square root of 27993228 is about 5290.8626895810. The cubic root of 27993228 is about 303.6344145226.

The spelling of 27993228 in words is "twenty-seven million, nine hundred ninety-three thousand, two hundred twenty-eight".