27996979 has 4 divisors (see below), whose sum is σ = 28334376. Its totient is φ = 27659584.

The previous prime is 27996967. The next prime is 27996989. The reversal of 27996979 is 97969972.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 27996979 - 2⁷ = 27996851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27996989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168574 + ... + 168739.

It is an arithmetic number, because the mean of its divisors is an integer number (7083594).

Almost surely, 2^27996979 is an apocalyptic number.

27996979 is a deficient number, since it is larger than the sum of its proper divisors (337397).

27996979 is an equidigital number, since it uses as much as digits as its factorization.

27996979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337396.

The product of its digits is 3857868, while the sum is 58.

The square root of 27996979 is about 5291.2171567608. The cubic root of 27996979 is about 303.6479759194.

The spelling of 27996979 in words is "twenty-seven million, nine hundred ninety-six thousand, nine hundred seventy-nine".