27788889 has 4 divisors (see below), whose sum is σ = 37051856. Its totient is φ = 18525924.

The previous prime is 27788881. The next prime is 27788923. The reversal of 27788889 is 98888772.

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 not a de Polignac number, because 27788889 - 2³ = 27788881 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (27788881) 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, 4631479 + ... + 4631484.

It is an arithmetic number, because the mean of its divisors is an integer number (9262964).

Almost surely, 2^27788889 is an apocalyptic number.

It is an amenable number.

27788889 is a deficient number, since it is larger than the sum of its proper divisors (9262967).

27788889 is an equidigital number, since it uses as much as digits as its factorization.

27788889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9262966.

The product of its digits is 3612672, while the sum is 57.

The square root of 27788889 is about 5271.5167646513. The cubic root of 27788889 is about 302.8938076171.

The spelling of 27788889 in words is "twenty-seven million, seven hundred eighty-eight thousand, eight hundred eighty-nine".