27902881 has 2 divisors, whose sum is σ = 27902882. Its totient is φ = 27902880.

The previous prime is 27902873. The next prime is 27902891. The reversal of 27902881 is 18820972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27248400 + 654481 = 5220^2 + 809^2 .

It is a cyclic number.

It is not a de Polignac number, because 27902881 - 2³ = 27902873 is a prime.

It is a super-2 number, since 2×27902881² = 1557141536200322, 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 27902881.

It is not a weakly prime, because it can be changed into another prime (27902891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13951440 + 13951441.

It is an arithmetic number, because the mean of its divisors is an integer number (13951441).

Almost surely, 2^27902881 is an apocalyptic number.

It is an amenable number.

27902881 is a deficient number, since it is larger than the sum of its proper divisors (1).

27902881 is an equidigital number, since it uses as much as digits as its factorization.

27902881 is an evil number, because the sum of its binary digits is even.

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

The square root of 27902881 is about 5282.3177677985. The cubic root of 27902881 is about 303.3074065779.

It can be divided in two parts, 2790 and 2881, that added together give a triangular number (5671 = T₁₀₆).

The spelling of 27902881 in words is "twenty-seven million, nine hundred two thousand, eight hundred eighty-one".