27801189 has 24 divisors (see below), whose sum is σ = 43610112. Its totient is φ = 16964640.

The previous prime is 27801173. The next prime is 27801253. The reversal of 27801189 is 98110872.

It is not a de Polignac number, because 27801189 - 2⁴ = 27801173 is a prime.

It is a super-2 number, since 2×27801189² = 1545812219627442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27801589) 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, 13924 + ... + 15794.

It is an arithmetic number, because the mean of its divisors is an integer number (1817088).

Almost surely, 2^27801189 is an apocalyptic number.

It is an amenable number.

27801189 is a deficient number, since it is larger than the sum of its proper divisors (15808923).

27801189 is a wasteful number, since it uses less digits than its factorization.

27801189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2017 (or 2014 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 27801189 is about 5272.6832827319. The cubic root of 27801189 is about 302.9384902754.

It can be divided in two parts, 2780 and 1189, that added together give a square (3969 = 63²).

The spelling of 27801189 in words is "twenty-seven million, eight hundred one thousand, one hundred eighty-nine".