27431145 has 24 divisors (see below), whose sum is σ = 54340416. Its totient is φ = 12539808.

The previous prime is 27431141. The next prime is 27431147. The reversal of 27431145 is 54113472.

It is not a de Polignac number, because 27431145 - 2² = 27431141 is a prime.

It is a super-2 number, since 2×27431145² = 1504935432022050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27431141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43227 + ... + 43856.

It is an arithmetic number, because the mean of its divisors is an integer number (2264184).

Almost surely, 2^27431145 is an apocalyptic number.

It is an amenable number.

27431145 is a deficient number, since it is larger than the sum of its proper divisors (26909271).

27431145 is a wasteful number, since it uses less digits than its factorization.

27431145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87101 (or 87098 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 27431145 is about 5237.4750596065. The cubic root of 27431145 is about 301.5884083533.

The spelling of 27431145 in words is "twenty-seven million, four hundred thirty-one thousand, one hundred forty-five".