27988997 has 4 divisors (see below), whose sum is σ = 28005120. Its totient is φ = 27972876.

The previous prime is 27988991. The next prime is 27989009. The reversal of 27988997 is 79988972.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27988997 is a prime.

It is a super-3 number, since 3×27988997³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27988991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5093 + ... + 9050.

It is an arithmetic number, because the mean of its divisors is an integer number (7001280).

Almost surely, 2^27988997 is an apocalyptic number.

It is an amenable number.

27988997 is a deficient number, since it is larger than the sum of its proper divisors (16123).

27988997 is a wasteful number, since it uses less digits than its factorization.

27988997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16122.

The product of its digits is 4572288, while the sum is 59.

The square root of 27988997 is about 5290.4628341951. The cubic root of 27988997 is about 303.6191162757.

The spelling of 27988997 in words is "twenty-seven million, nine hundred eighty-eight thousand, nine hundred ninety-seven".