87508521 has 12 divisors (see below), whose sum is σ = 127654020. Its totient is φ = 57760800.

The previous prime is 87508517. The next prime is 87508549. The reversal of 87508521 is 12580578.

87508521 is a `hidden beast` number, since 87 + 50 + 8 + 521 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 85766121 + 1742400 = 9261^2 + 1320^2 .

It is not a de Polignac number, because 87508521 - 2² = 87508517 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87508511) 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 11 ways as a sum of consecutive naturals, for example, 47226 + ... + 49043.

It is an arithmetic number, because the mean of its divisors is an integer number (10637835).

Almost surely, 2^87508521 is an apocalyptic number.

It is an amenable number.

87508521 is a deficient number, since it is larger than the sum of its proper divisors (40145499).

87508521 is a wasteful number, since it uses less digits than its factorization.

87508521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96376 (or 96373 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 87508521 is about 9354.5989224552. The cubic root of 87508521 is about 443.9664115083.

It can be divided in two parts, 8750 and 8521, that added together give a palindrome (17271).

The spelling of 87508521 in words is "eighty-seven million, five hundred eight thousand, five hundred twenty-one".