27980916 has 12 divisors (see below), whose sum is σ = 65288832. Its totient is φ = 9326968.

The previous prime is 27980837. The next prime is 27980987. The reversal of 27980916 is 61908972.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1165860 + ... + 1165883.

It is an arithmetic number, because the mean of its divisors is an integer number (5440736).

Almost surely, 2^27980916 is an apocalyptic number.

It is an amenable number.

27980916 is an abundant number, since it is smaller than the sum of its proper divisors (37307916).

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

27980916 is a wasteful number, since it uses less digits than its factorization.

27980916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2331750 (or 2331748 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 27980916 is about 5289.6990462596. The cubic root of 27980916 is about 303.5898930987.

The spelling of 27980916 in words is "twenty-seven million, nine hundred eighty thousand, nine hundred sixteen".