27788891 has 8 divisors (see below), whose sum is σ = 30563904. Its totient is φ = 25104960.

The previous prime is 27788881. The next prime is 27788923. The reversal of 27788891 is 19888772.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27788891 - 2¹⁰ = 27787867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27788881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22130 + ... + 23351.

It is an arithmetic number, because the mean of its divisors is an integer number (3820488).

Almost surely, 2^27788891 is an apocalyptic number.

27788891 is a deficient number, since it is larger than the sum of its proper divisors (2775013).

27788891 is a wasteful number, since it uses less digits than its factorization.

27788891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45541.

The product of its digits is 451584, while the sum is 50.

The square root of 27788891 is about 5271.5169543500. The cubic root of 27788891 is about 302.8938148837.

The spelling of 27788891 in words is "twenty-seven million, seven hundred eighty-eight thousand, eight hundred ninety-one".