27128987 has 2 divisors, whose sum is σ = 27128988. Its totient is φ = 27128986.

The previous prime is 27128953. The next prime is 27129013. The reversal of 27128987 is 78982172.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27128987 - 2¹² = 27124891 is a prime.

It is a super-3 number, since 3×27128987³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27128947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13564493 + 13564494.

It is an arithmetic number, because the mean of its divisors is an integer number (13564494).

Almost surely, 2^27128987 is an apocalyptic number.

27128987 is a deficient number, since it is larger than the sum of its proper divisors (1).

27128987 is an equidigital number, since it uses as much as digits as its factorization.

27128987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 44.

The square root of 27128987 is about 5208.5494141843. The cubic root of 27128987 is about 300.4769708903.

The spelling of 27128987 in words is "twenty-seven million, one hundred twenty-eight thousand, nine hundred eighty-seven".