27780222 has 16 divisors (see below), whose sum is σ = 55761552. Its totient is φ = 9226560.

The previous prime is 27780217. The next prime is 27780281. The reversal of 27780222 is 22208772.

It is a self number, because there is not a number n which added to its sum of digits gives 27780222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6553 + ... + 9924.

It is an arithmetic number, because the mean of its divisors is an integer number (3485097).

Almost surely, 2^27780222 is an apocalyptic number.

27780222 is an abundant number, since it is smaller than the sum of its proper divisors (27981330).

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

27780222 is a wasteful number, since it uses less digits than its factorization.

27780222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16763.

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 27780222 is about 5270.6946411265. The cubic root of 27780222 is about 302.8623147712.

Adding to 27780222 its reverse (22208772), we get a palindrome (49988994).

The spelling of 27780222 in words is "twenty-seven million, seven hundred eighty thousand, two hundred twenty-two".