27989892 has 72 divisors (see below), whose sum is σ = 81681600. Its totient is φ = 7915968.

The previous prime is 27989891. The next prime is 27989893. The reversal of 27989892 is 29898972.

It is an interprime number because it is at equal distance from previous prime (27989891) and next prime (27989893).

It is not an unprimeable number, because it can be changed into a prime (27989891) 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, 26959 + ... + 27977.

Almost surely, 2^27989892 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 27989892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40840800).

27989892 is an abundant number, since it is smaller than the sum of its proper divisors (53691708).

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

27989892 is a wasteful number, since it uses less digits than its factorization.

27989892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145 (or 1140 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 27989892 is about 5290.5474196911. The cubic root of 27989892 is about 303.6223525024.

The spelling of 27989892 in words is "twenty-seven million, nine hundred eighty-nine thousand, eight hundred ninety-two".