27215987 has 2 divisors, whose sum is σ = 27215988. Its totient is φ = 27215986.

The previous prime is 27215971. The next prime is 27216001. The reversal of 27215987 is 78951272.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27215987 - 2⁴ = 27215971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27215927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13607993 + 13607994.

It is an arithmetic number, because the mean of its divisors is an integer number (13607994).

Almost surely, 2^27215987 is an apocalyptic number.

27215987 is a deficient number, since it is larger than the sum of its proper divisors (1).

27215987 is an equidigital number, since it uses as much as digits as its factorization.

27215987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70560, while the sum is 41.

The square root of 27215987 is about 5216.8943826763. The cubic root of 27215987 is about 300.7978282048.

The spelling of 27215987 in words is "twenty-seven million, two hundred fifteen thousand, nine hundred eighty-seven".