87521540 has 24 divisors (see below), whose sum is σ = 184071552. Its totient is φ = 34956000.

The previous prime is 87521537. The next prime is 87521569. The reversal of 87521540 is 4512578.

It is a junction number, because it is equal to n+sod(n) for n = 87521497 and 87521506.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12107 + ... + 17933.

It is an arithmetic number, because the mean of its divisors is an integer number (7669648).

Almost surely, 2^87521540 is an apocalyptic number.

It is an amenable number.

87521540 is an abundant number, since it is smaller than the sum of its proper divisors (96550012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87521540 is a wasteful number, since it uses less digits than its factorization.

87521540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6587 (or 6585 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 87521540 is about 9355.2947575157. The cubic root of 87521540 is about 443.9884273152.

The spelling of 87521540 in words is "eighty-seven million, five hundred twenty-one thousand, five hundred forty".