87135987 has 4 divisors (see below), whose sum is σ = 116181320. Its totient is φ = 58090656.

The previous prime is 87135949. The next prime is 87135989. The reversal of 87135987 is 78953178.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 87135987 - 2¹¹ = 87133939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87135989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14522662 + ... + 14522667.

It is an arithmetic number, because the mean of its divisors is an integer number (29045330).

Almost surely, 2^87135987 is an apocalyptic number.

87135987 is a deficient number, since it is larger than the sum of its proper divisors (29045333).

87135987 is a wasteful number, since it uses less digits than its factorization.

87135987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29045332.

The product of its digits is 423360, while the sum is 48.

The square root of 87135987 is about 9334.6658751130. The cubic root of 87135987 is about 443.3355097537.

The spelling of 87135987 in words is "eighty-seven million, one hundred thirty-five thousand, nine hundred eighty-seven".