87506013 has 24 divisors (see below), whose sum is σ = 139043520. Its totient is φ = 48780480.

The previous prime is 87506011. The next prime is 87506017. The reversal of 87506013 is 31060578.

It is not a de Polignac number, because 87506013 - 2¹ = 87506011 is a prime.

It is a super-2 number, since 2×87506013² = 15314604622312338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87506011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1233 + ... + 13286.

It is an arithmetic number, because the mean of its divisors is an integer number (5793480).

Almost surely, 2^87506013 is an apocalyptic number.

It is an amenable number.

87506013 is a deficient number, since it is larger than the sum of its proper divisors (51537507).

87506013 is a wasteful number, since it uses less digits than its factorization.

87506013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14577 (or 14570 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 87506013 is about 9354.4648697828. The cubic root of 87506013 is about 443.9621700989.

The spelling of 87506013 in words is "eighty-seven million, five hundred six thousand, thirteen".