27812979 has 12 divisors (see below), whose sum is σ = 42289000. Its totient is φ = 17565984.

The previous prime is 27812963. The next prime is 27812989. The reversal of 27812979 is 97921872.

It is not a de Polignac number, because 27812979 - 2⁴ = 27812963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27812929) 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, 81154 + ... + 81495.

Almost surely, 2^27812979 is an apocalyptic number.

27812979 is a deficient number, since it is larger than the sum of its proper divisors (14476021).

27812979 is a wasteful number, since it uses less digits than its factorization.

27812979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162674 (or 162671 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 27812979 is about 5273.8011907921. The cubic root of 27812979 is about 302.9813078689.

The spelling of 27812979 in words is "twenty-seven million, eight hundred twelve thousand, nine hundred seventy-nine".