27998885 has 4 divisors (see below), whose sum is σ = 33598668. Its totient is φ = 22399104.

The previous prime is 27998879. The next prime is 27998897. The reversal of 27998885 is 58889972.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11950849 + 16048036 = 3457^2 + 4006^2 .

It is a cyclic number.

It is not a de Polignac number, because 27998885 - 2⁴ = 27998869 is a prime.

It is a super-2 number, since 2×27998885² = 1567875122486450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27998885.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2799884 + ... + 2799893.

It is an arithmetic number, because the mean of its divisors is an integer number (8399667).

Almost surely, 2^27998885 is an apocalyptic number.

It is an amenable number.

27998885 is a deficient number, since it is larger than the sum of its proper divisors (5599783).

27998885 is an equidigital number, since it uses as much as digits as its factorization.

27998885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5599782.

The product of its digits is 2903040, while the sum is 56.

The square root of 27998885 is about 5291.3972634834. The cubic root of 27998885 is about 303.6548664237.

The spelling of 27998885 in words is "twenty-seven million, nine hundred ninety-eight thousand, eight hundred eighty-five".