27722988 has 72 divisors (see below), whose sum is σ = 75125232. Its totient is φ = 8589312.

The previous prime is 27722987. The next prime is 27722993. The reversal of 27722988 is 88922772.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (27722987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59131 + ... + 59597.

It is an arithmetic number, because the mean of its divisors is an integer number (1043406).

Almost surely, 2^27722988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27722988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37562616).

27722988 is an abundant number, since it is smaller than the sum of its proper divisors (47402244).

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

27722988 is a wasteful number, since it uses less digits than its factorization.

27722988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591 (or 586 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 27722988 is about 5265.2623866242. The cubic root of 27722988 is about 302.6541818117.

The spelling of 27722988 in words is "twenty-seven million, seven hundred twenty-two thousand, nine hundred eighty-eight".