27981656 has 16 divisors (see below), whose sum is σ = 52880640. Its totient is φ = 13880160.

The previous prime is 27981647. The next prime is 27981697. The reversal of 27981656 is 65618972.

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, 12755 + ... + 14786.

It is an arithmetic number, because the mean of its divisors is an integer number (3305040).

Almost surely, 2^27981656 is an apocalyptic number.

It is an amenable number.

27981656 is a deficient number, since it is larger than the sum of its proper divisors (24898984).

27981656 is a wasteful number, since it uses less digits than its factorization.

27981656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27674 (or 27670 counting only the distinct ones).

The product of its digits is 181440, while the sum is 44.

The square root of 27981656 is about 5289.7689930658. The cubic root of 27981656 is about 303.5925693816.

The spelling of 27981656 in words is "twenty-seven million, nine hundred eighty-one thousand, six hundred fifty-six".