27979956 has 18 divisors (see below), whose sum is σ = 70727202. Its totient is φ = 9326640.

The previous prime is 27979933. The next prime is 27979957. The reversal of 27979956 is 65997972.

It can be written as a sum of positive squares in only one way, i.e., 17089956 + 10890000 = 4134^2 + 3300^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27979957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 388575 + ... + 388646.

It is an arithmetic number, because the mean of its divisors is an integer number (3929289).

Almost surely, 2^27979956 is an apocalyptic number.

It is an amenable number.

27979956 is an abundant number, since it is smaller than the sum of its proper divisors (42747246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27979956 is a wasteful number, since it uses less digits than its factorization.

27979956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777231 (or 777226 counting only the distinct ones).

The product of its digits is 2143260, while the sum is 54.

The square root of 27979956 is about 5289.6083030788. The cubic root of 27979956 is about 303.5864210938.

The spelling of 27979956 in words is "twenty-seven million, nine hundred seventy-nine thousand, nine hundred fifty-six".