27813231 has 12 divisors (see below), whose sum is σ = 41471040. Its totient is φ = 17943840.

The previous prime is 27813221. The next prime is 27813239. The reversal of 27813231 is 13231872.

It is not a de Polignac number, because 27813231 - 2⁶ = 27813167 is a prime.

It is a super-2 number, since 2×27813231² = 1547151637318722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 27813195 and 27813204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27813239) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49566 + ... + 50123.

It is an arithmetic number, because the mean of its divisors is an integer number (3455920).

Almost surely, 2^27813231 is an apocalyptic number.

27813231 is a deficient number, since it is larger than the sum of its proper divisors (13657809).

27813231 is a wasteful number, since it uses less digits than its factorization.

27813231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99726 (or 99723 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 27813231 is about 5273.8250824236. The cubic root of 27813231 is about 302.9822229220.

The spelling of 27813231 in words is "twenty-seven million, eight hundred thirteen thousand, two hundred thirty-one".