27890415257 has 2 divisors, whose sum is σ = 27890415258. Its totient is φ = 27890415256.

The previous prime is 27890415239. The next prime is 27890415299. The reversal of 27890415257 is 75251409872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25129858576 + 2760556681 = 158524^2 + 52541^2 .

It is a cyclic number.

It is not a de Polignac number, because 27890415257 - 2¹⁸ = 27890153113 is a prime.

It is not a weakly prime, because it can be changed into another prime (27890415557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13945207628 + 13945207629.

It is an arithmetic number, because the mean of its divisors is an integer number (13945207629).

Almost surely, 2^27890415257 is an apocalyptic number.

It is an amenable number.

27890415257 is a deficient number, since it is larger than the sum of its proper divisors (1).

27890415257 is an equidigital number, since it uses as much as digits as its factorization.

27890415257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1411200, while the sum is 50.

The spelling of 27890415257 in words is "twenty-seven billion, eight hundred ninety million, four hundred fifteen thousand, two hundred fifty-seven".