87085013 has 4 divisors (see below), whose sum is σ = 89438700. Its totient is φ = 84731328.

The previous prime is 87085007. The next prime is 87085021. The reversal of 87085013 is 31058078.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45185284 + 41899729 = 6722^2 + 6473^2 .

It is a cyclic number.

It is not a de Polignac number, because 87085013 - 2⁴ = 87084997 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 (87085213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1176788 + ... + 1176861.

It is an arithmetic number, because the mean of its divisors is an integer number (22359675).

Almost surely, 2^87085013 is an apocalyptic number.

It is an amenable number.

87085013 is a deficient number, since it is larger than the sum of its proper divisors (2353687).

87085013 is a wasteful number, since it uses less digits than its factorization.

87085013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2353686.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 87085013 is about 9331.9351155053. The cubic root of 87085013 is about 443.2490434032.

The spelling of 87085013 in words is "eighty-seven million, eighty-five thousand, thirteen".