87521487 has 8 divisors (see below), whose sum is σ = 118339200. Its totient is φ = 57525720.

The previous prime is 87521477. The next prime is 87521531. The reversal of 87521487 is 78412578.

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

It is not a de Polignac number, because 87521487 - 2⁴ = 87521471 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87521437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205237 + ... + 205662.

It is an arithmetic number, because the mean of its divisors is an integer number (14792400).

Almost surely, 2^87521487 is an apocalyptic number.

87521487 is a deficient number, since it is larger than the sum of its proper divisors (30817713).

87521487 is a wasteful number, since it uses less digits than its factorization.

87521487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410973.

The product of its digits is 125440, while the sum is 42.

The square root of 87521487 is about 9355.2919248947. The cubic root of 87521487 is about 443.9883376938.

The spelling of 87521487 in words is "eighty-seven million, five hundred twenty-one thousand, four hundred eighty-seven".