87013987 has 2 divisors, whose sum is σ = 87013988. Its totient is φ = 87013986.

The previous prime is 87013981. The next prime is 87014003. The reversal of 87013987 is 78931078.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87013987 - 2⁷ = 87013859 is a prime.

It is not a weakly prime, because it can be changed into another prime (87013981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43506993 + 43506994.

It is an arithmetic number, because the mean of its divisors is an integer number (43506994).

Almost surely, 2^87013987 is an apocalyptic number.

87013987 is a deficient number, since it is larger than the sum of its proper divisors (1).

87013987 is an equidigital number, since it uses as much as digits as its factorization.

87013987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 87013987 is about 9328.1288048568. The cubic root of 87013987 is about 443.1285068981.

The spelling of 87013987 in words is "eighty-seven million, thirteen thousand, nine hundred eighty-seven".