27055981 has 16 divisors (see below), whose sum is σ = 30061440. Its totient is φ = 24235200.

The previous prime is 27055979. The next prime is 27055997. The reversal of 27055981 is 18955072.

27055981 = T₁₁₀ + T₁₁₁ + ... + T₅₄₆.

It is a cyclic number.

It is not a de Polignac number, because 27055981 - 2¹ = 27055979 is a prime.

It is a super-2 number, since 2×27055981² = 1464052215744722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27055981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27055961) 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, 43831 + ... + 44443.

It is an arithmetic number, because the mean of its divisors is an integer number (1878840).

Almost surely, 2^27055981 is an apocalyptic number.

It is an amenable number.

27055981 is a deficient number, since it is larger than the sum of its proper divisors (3005459).

27055981 is a wasteful number, since it uses less digits than its factorization.

27055981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 27055981 is about 5201.5364076396. The cubic root of 27055981 is about 300.2071939064.

The spelling of 27055981 in words is "twenty-seven million, fifty-five thousand, nine hundred eighty-one".