87112813 has 4 divisors (see below), whose sum is σ = 87460128. Its totient is φ = 86765500.

The previous prime is 87112801. The next prime is 87112841. The reversal of 87112813 is 31821178.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87112813 - 2²¹ = 85015661 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87110813) 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, 173281 + ... + 173782.

It is an arithmetic number, because the mean of its divisors is an integer number (21865032).

Almost surely, 2^87112813 is an apocalyptic number.

It is an amenable number.

87112813 is a deficient number, since it is larger than the sum of its proper divisors (347315).

87112813 is a wasteful number, since it uses less digits than its factorization.

87112813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347314.

The product of its digits is 2688, while the sum is 31.

The square root of 87112813 is about 9333.4245055071. The cubic root of 87112813 is about 443.2962042636.

The spelling of 87112813 in words is "eighty-seven million, one hundred twelve thousand, eight hundred thirteen".