27881257 has 2 divisors, whose sum is σ = 27881258. Its totient is φ = 27881256.

The previous prime is 27881201. The next prime is 27881263. The reversal of 27881257 is 75218872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22005481 + 5875776 = 4691^2 + 2424^2 .

It is a cyclic number.

It is not a de Polignac number, because 27881257 - 2¹⁵ = 27848489 is a prime.

It is not a weakly prime, because it can be changed into another prime (27881057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13940628 + 13940629.

It is an arithmetic number, because the mean of its divisors is an integer number (13940629).

Almost surely, 2^27881257 is an apocalyptic number.

It is an amenable number.

27881257 is a deficient number, since it is larger than the sum of its proper divisors (1).

27881257 is an equidigital number, since it uses as much as digits as its factorization.

27881257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62720, while the sum is 40.

The square root of 27881257 is about 5280.2705423113. The cubic root of 27881257 is about 303.2290345708.

The spelling of 27881257 in words is "twenty-seven million, eight hundred eighty-one thousand, two hundred fifty-seven".