87108490813 has 4 divisors (see below), whose sum is σ = 87110597340. Its totient is φ = 87106384288.

The previous prime is 87108490783. The next prime is 87108490837. The reversal of 87108490813 is 31809480178.

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 37371462489 + 49737028324 = 193317^2 + 223018^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87108490813 is a prime.

It is a Smith number, since the sum of its digits (49) 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 (87108490853) 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, 989968 + ... + 1074361.

It is an arithmetic number, because the mean of its divisors is an integer number (21777649335).

Almost surely, 2^87108490813 is an apocalyptic number.

It is an amenable number.

87108490813 is a deficient number, since it is larger than the sum of its proper divisors (2106527).

87108490813 is a wasteful number, since it uses less digits than its factorization.

87108490813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106526.

The product of its (nonzero) digits is 387072, while the sum is 49.

The spelling of 87108490813 in words is "eighty-seven billion, one hundred eight million, four hundred ninety thousand, eight hundred thirteen".