87431515 has 8 divisors (see below), whose sum is σ = 107150400. Its totient is φ = 68456832.

The previous prime is 87431497. The next prime is 87431543. The reversal of 87431515 is 51513478.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87431515 - 2¹⁷ = 87300443 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185790 + ... + 186259.

It is an arithmetic number, because the mean of its divisors is an integer number (13393800).

Almost surely, 2^87431515 is an apocalyptic number.

87431515 is a deficient number, since it is larger than the sum of its proper divisors (19718885).

87431515 is a wasteful number, since it uses less digits than its factorization.

87431515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372101.

The product of its digits is 16800, while the sum is 34.

The square root of 87431515 is about 9350.4820731340. The cubic root of 87431515 is about 443.8361456770.

The spelling of 87431515 in words is "eighty-seven million, four hundred thirty-one thousand, five hundred fifteen".