87010813 has 4 divisors (see below), whose sum is σ = 87565180. Its totient is φ = 86456448.

The previous prime is 87010799. The next prime is 87010849. The reversal of 87010813 is 31801078.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31801078 = 2 ⋅15900539.

It can be written as a sum of positive squares in 2 ways, for example, as 32058244 + 54952569 = 5662^2 + 7413^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87010813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87010873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276948 + ... + 277261.

It is an arithmetic number, because the mean of its divisors is an integer number (21891295).

Almost surely, 2^87010813 is an apocalyptic number.

It is an amenable number.

87010813 is a deficient number, since it is larger than the sum of its proper divisors (554367).

87010813 is a wasteful number, since it uses less digits than its factorization.

87010813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554366.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 87010813 is about 9327.9586727215. The cubic root of 87010813 is about 443.1231188487.

The spelling of 87010813 in words is "eighty-seven million, ten thousand, eight hundred thirteen".