27280981 has 16 divisors (see below), whose sum is σ = 33712000. Its totient is φ = 21498048.

The previous prime is 27280973. The next prime is 27280987. The reversal of 27280981 is 18908272.

It is not a de Polignac number, because 27280981 - 2³ = 27280973 is a prime.

It is a super-2 number, since 2×27280981² = 1488503848644722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 27280981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27280987) 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, 31330 + ... + 32188.

It is an arithmetic number, because the mean of its divisors is an integer number (2107000).

Almost surely, 2^27280981 is an apocalyptic number.

It is an amenable number.

27280981 is a deficient number, since it is larger than the sum of its proper divisors (6431019).

27280981 is a wasteful number, since it uses less digits than its factorization.

27280981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 27280981 is about 5223.1198531146. The cubic root of 27280981 is about 301.0370811151.

The spelling of 27280981 in words is "twenty-seven million, two hundred eighty thousand, nine hundred eighty-one".