27280861 has 2 divisors, whose sum is σ = 27280862. Its totient is φ = 27280860.

The previous prime is 27280831. The next prime is 27280879. The reversal of 27280861 is 16808272.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19412836 + 7868025 = 4406^2 + 2805^2 .

It is a cyclic number.

It is not a de Polignac number, because 27280861 - 2⁹ = 27280349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27280831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13640430 + 13640431.

It is an arithmetic number, because the mean of its divisors is an integer number (13640431).

Almost surely, 2^27280861 is an apocalyptic number.

It is an amenable number.

27280861 is a deficient number, since it is larger than the sum of its proper divisors (1).

27280861 is an equidigital number, since it uses as much as digits as its factorization.

27280861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 27280861 is about 5223.1083657148. The cubic root of 27280861 is about 301.0366397269.

The spelling of 27280861 in words is "twenty-seven million, two hundred eighty thousand, eight hundred sixty-one".