27898009 has 4 divisors (see below), whose sum is σ = 28038400. Its totient is φ = 27757620.

The previous prime is 27898007. The next prime is 27898019. The reversal of 27898009 is 90089872.

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 not a de Polignac number, because 27898009 - 2¹ = 27898007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27898001) 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, 69897 + ... + 70294.

It is an arithmetic number, because the mean of its divisors is an integer number (7009600).

Almost surely, 2^27898009 is an apocalyptic number.

It is an amenable number.

27898009 is a deficient number, since it is larger than the sum of its proper divisors (140391).

27898009 is a wasteful number, since it uses less digits than its factorization.

27898009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140390.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 27898009 is about 5281.8565864665. The cubic root of 27898009 is about 303.2897524905.

The spelling of 27898009 in words is "twenty-seven million, eight hundred ninety-eight thousand, nine".