27777228 has 12 divisors (see below), whose sum is σ = 64813560. Its totient is φ = 9259072.

The previous prime is 27777227. The next prime is 27777241. The reversal of 27777228 is 82277772.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 27777228.

It is not an unprimeable number, because it can be changed into a prime (27777223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1157373 + ... + 1157396.

It is an arithmetic number, because the mean of its divisors is an integer number (5401130).

Almost surely, 2^27777228 is an apocalyptic number.

It is an amenable number.

27777228 is an abundant number, since it is smaller than the sum of its proper divisors (37036332).

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

27777228 is a wasteful number, since it uses less digits than its factorization.

27777228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2314776 (or 2314774 counting only the distinct ones).

The product of its digits is 153664, while the sum is 42.

The square root of 27777228 is about 5270.4106101897. The cubic root of 27777228 is about 302.8514341005.

The spelling of 27777228 in words is "twenty-seven million, seven hundred seventy-seven thousand, two hundred twenty-eight".