27781089 has 24 divisors (see below), whose sum is σ = 44016768. Its totient is φ = 15533280.

The previous prime is 27781087. The next prime is 27781129. The reversal of 27781089 is 98018772.

It is not a de Polignac number, because 27781089 - 2¹ = 27781087 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27781089.

It is not an unprimeable number, because it can be changed into a prime (27781087) 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, 4899 + ... + 8919.

It is an arithmetic number, because the mean of its divisors is an integer number (1834032).

Almost surely, 2^27781089 is an apocalyptic number.

It is an amenable number.

27781089 is a deficient number, since it is larger than the sum of its proper divisors (16235679).

27781089 is a wasteful number, since it uses less digits than its factorization.

27781089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4085 (or 4078 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 27781089 is about 5270.7768877083. The cubic root of 27781089 is about 302.8654654407.

The spelling of 27781089 in words is "twenty-seven million, seven hundred eighty-one thousand, eighty-nine".