27980065 has 16 divisors (see below), whose sum is σ = 35481600. Its totient is φ = 21123072.

The previous prime is 27980063. The next prime is 27980083. The reversal of 27980065 is 56008972.

It is a cyclic number.

It is not a de Polignac number, because 27980065 - 2¹ = 27980063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27980063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36001 + ... + 36769.

It is an arithmetic number, because the mean of its divisors is an integer number (2217600).

Almost surely, 2^27980065 is an apocalyptic number.

It is an amenable number.

27980065 is a deficient number, since it is larger than the sum of its proper divisors (7501535).

27980065 is a wasteful number, since it uses less digits than its factorization.

27980065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 27980065 is about 5289.6186062891. The cubic root of 27980065 is about 303.5868153150.

The spelling of 27980065 in words is "twenty-seven million, nine hundred eighty thousand, sixty-five".