27158987 has 2 divisors, whose sum is σ = 27158988. Its totient is φ = 27158986.

The previous prime is 27158983. The next prime is 27159023. The reversal of 27158987 is 78985172.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27158987 - 2² = 27158983 is a prime.

It is a super-2 number, since 2×27158987² = 1475221149732338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27158981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13579493 + 13579494.

It is an arithmetic number, because the mean of its divisors is an integer number (13579494).

Almost surely, 2^27158987 is an apocalyptic number.

27158987 is a deficient number, since it is larger than the sum of its proper divisors (1).

27158987 is an equidigital number, since it uses as much as digits as its factorization.

27158987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282240, while the sum is 47.

The square root of 27158987 is about 5211.4284989818. The cubic root of 27158987 is about 300.5876887288.

The spelling of 27158987 in words is "twenty-seven million, one hundred fifty-eight thousand, nine hundred eighty-seven".