8787521 has 12 divisors (see below), whose sum is σ = 9530892. Its totient is φ = 8073216.

The previous prime is 8787503. The next prime is 8787529. The reversal of 8787521 is 1257878.

It can be written as a sum of positive squares in 6 ways, for example, as 313600 + 8473921 = 560^2 + 2911^2 .

It is a de Polignac number, because none of the positive numbers 2^k-8787521 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8787529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90545 + ... + 90641.

It is an arithmetic number, because the mean of its divisors is an integer number (794241).

Almost surely, 2^8787521 is an apocalyptic number.

It is an amenable number.

8787521 is a deficient number, since it is larger than the sum of its proper divisors (743371).

8787521 is an equidigital number, since it uses as much as digits as its factorization.

8787521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260 (or 187 counting only the distinct ones).

The product of its digits is 31360, while the sum is 38.

The square root of 8787521 is about 2964.3753136201. The cubic root of 8787521 is about 206.3583873529.

The spelling of 8787521 in words is "eight million, seven hundred eighty-seven thousand, five hundred twenty-one".