27221616 has 80 divisors (see below), whose sum is σ = 79493920. Its totient is φ = 8916480.

The previous prime is 27221599. The next prime is 27221617. The reversal of 27221616 is 61612272.

27221616 is a `hidden beast` number, since 27 + 2 + 21 + 616 = 666.

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 27221616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27221617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25836 + ... + 26868.

It is an arithmetic number, because the mean of its divisors is an integer number (993674).

Almost surely, 2^27221616 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 27221616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39746960).

27221616 is an abundant number, since it is smaller than the sum of its proper divisors (52272304).

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

27221616 is a wasteful number, since it uses less digits than its factorization.

27221616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111 (or 1099 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 27221616 is about 5217.4338520004. The cubic root of 27221616 is about 300.8185644759.

Adding to 27221616 its reverse (61612272), we get a palindrome (88833888).

The spelling of 27221616 in words is "twenty-seven million, two hundred twenty-one thousand, six hundred sixteen".