27705231 has 12 divisors (see below), whose sum is σ = 40870752. Its totient is φ = 18076896.

The previous prime is 27705229. The next prime is 27705239. The reversal of 27705231 is 13250772.

It is not a de Polignac number, because 27705231 - 2¹ = 27705229 is a prime.

It is a super-2 number, since 2×27705231² = 1535159649526722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 27705195 and 27705204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27705239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32326 + ... + 33171.

It is an arithmetic number, because the mean of its divisors is an integer number (3405896).

Almost surely, 2^27705231 is an apocalyptic number.

27705231 is a deficient number, since it is larger than the sum of its proper divisors (13165521).

27705231 is a wasteful number, since it uses less digits than its factorization.

27705231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65550 (or 65547 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 27705231 is about 5263.5758757711. The cubic root of 27705231 is about 302.5895497917.

It can be divided in two parts, 2770 and 5231, that added together give a triangular number (8001 = T₁₂₆).

The spelling of 27705231 in words is "twenty-seven million, seven hundred five thousand, two hundred thirty-one".