27981513 has 12 divisors (see below), whose sum is σ = 46191808. Its totient is φ = 15989400.

The previous prime is 27981487. The next prime is 27981521. The reversal of 27981513 is 31518972.

It is not a de Polignac number, because 27981513 - 2⁶ = 27981449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27981523) 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, 222013 + ... + 222138.

Almost surely, 2^27981513 is an apocalyptic number.

It is an amenable number.

27981513 is a deficient number, since it is larger than the sum of its proper divisors (18210295).

27981513 is a wasteful number, since it uses less digits than its factorization.

27981513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444164 (or 444161 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 27981513 is about 5289.7554763902. The cubic root of 27981513 is about 303.5920522117.

The spelling of 27981513 in words is "twenty-seven million, nine hundred eighty-one thousand, five hundred thirteen".