87431505 has 16 divisors (see below), whose sum is σ = 159874944. Its totient is φ = 39968640.

The previous prime is 87431497. The next prime is 87431543. The reversal of 87431505 is 50513478.

It is not a de Polignac number, because 87431505 - 2³ = 87431497 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 416236 + ... + 416445.

It is an arithmetic number, because the mean of its divisors is an integer number (9992184).

Almost surely, 2^87431505 is an apocalyptic number.

It is an amenable number.

87431505 is a deficient number, since it is larger than the sum of its proper divisors (72443439).

87431505 is a wasteful number, since it uses less digits than its factorization.

87431505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832696.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 87431505 is about 9350.4815384022. The cubic root of 87431505 is about 443.8361287557.

The spelling of 87431505 in words is "eighty-seven million, four hundred thirty-one thousand, five hundred five".