27955987 has 2 divisors, whose sum is σ = 27955988. Its totient is φ = 27955986.

The previous prime is 27955957. The next prime is 27955999. The reversal of 27955987 is 78955972.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27955987 - 2¹⁹ = 27431699 is a prime.

It is not a weakly prime, because it can be changed into another prime (27955927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13977993 + 13977994.

It is an arithmetic number, because the mean of its divisors is an integer number (13977994).

Almost surely, 2^27955987 is an apocalyptic number.

27955987 is a deficient number, since it is larger than the sum of its proper divisors (1).

27955987 is an equidigital number, since it uses as much as digits as its factorization.

27955987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1587600, while the sum is 52.

The square root of 27955987 is about 5287.3421489440. The cubic root of 27955987 is about 303.4997073314.

The spelling of 27955987 in words is "twenty-seven million, nine hundred fifty-five thousand, nine hundred eighty-seven".