87136427 has 4 divisors (see below), whose sum is σ = 99584496. Its totient is φ = 74688360.

The previous prime is 87136421. The next prime is 87136433. The reversal of 87136427 is 72463178.

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

It is an interprime number because it is at equal distance from previous prime (87136421) and next prime (87136433).

It is a cyclic number.

It is not a de Polignac number, because 87136427 - 2⁴ = 87136411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87136421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6224024 + ... + 6224037.

It is an arithmetic number, because the mean of its divisors is an integer number (24896124).

Almost surely, 2^87136427 is an apocalyptic number.

87136427 is a deficient number, since it is larger than the sum of its proper divisors (12448069).

87136427 is a wasteful number, since it uses less digits than its factorization.

87136427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12448068.

The product of its digits is 56448, while the sum is 38.

The square root of 87136427 is about 9334.6894431470. The cubic root of 87136427 is about 443.3362559716.

The spelling of 87136427 in words is "eighty-seven million, one hundred thirty-six thousand, four hundred twenty-seven".