27721116 has 60 divisors (see below), whose sum is σ = 73607688. Its totient is φ = 9095328.

The previous prime is 27721081. The next prime is 27721139. The reversal of 27721116 is 61112772.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 27721116.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 21070 + ... + 22346.

Almost surely, 2^27721116 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 27721116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36803844).

27721116 is an abundant number, since it is smaller than the sum of its proper divisors (45886572).

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

27721116 is a wasteful number, since it uses less digits than its factorization.

27721116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360 (or 1349 counting only the distinct ones).

The product of its digits is 1176, while the sum is 27.

The square root of 27721116 is about 5265.0846147047. The cubic root of 27721116 is about 302.6473693981.

Adding to 27721116 its reverse (61112772), we get a palindrome (88833888).

The spelling of 27721116 in words is "twenty-seven million, seven hundred twenty-one thousand, one hundred sixteen".