27931225 has 27 divisors (see below), whose sum is σ = 40557951. Its totient is φ = 19026000.

The previous prime is 27931219. The next prime is 27931271. The reversal of 27931225 is 52213972.

The square root of 27931225 is 5285.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 10055241 + 17875984 = 3171^2 + 4228^2 .

It is not a de Polignac number, because 27931225 - 2⁵ = 27931193 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 184900 + ... + 185050.

Almost surely, 2^27931225 is an apocalyptic number.

27931225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

27931225 is the 5285-th square number.

27931225 is the 2643-rd centered octagonal number.

It is an amenable number.

27931225 is a deficient number, since it is larger than the sum of its proper divisors (12626726).

27931225 is an equidigital number, since it uses as much as digits as its factorization.

27931225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326 (or 163 counting only the distinct ones).

The product of its digits is 7560, while the sum is 31.

The cubic root of 27931225 is about 303.4100726290.

The spelling of 27931225 in words is "twenty-seven million, nine hundred thirty-one thousand, two hundred twenty-five".