87836993 has 4 divisors (see below), whose sum is σ = 87857028. Its totient is φ = 87816960.

The previous prime is 87836971. The next prime is 87836999. The reversal of 87836993 is 39963878.

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 77228944 + 10608049 = 8788^2 + 3257^2 .

It is a cyclic number.

It is not a de Polignac number, because 87836993 - 2¹⁴ = 87820609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87836999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 296 + ... + 13257.

It is an arithmetic number, because the mean of its divisors is an integer number (21964257).

Almost surely, 2^87836993 is an apocalyptic number.

It is an amenable number.

87836993 is a deficient number, since it is larger than the sum of its proper divisors (20035).

87836993 is a wasteful number, since it uses less digits than its factorization.

87836993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20034.

The product of its digits is 1959552, while the sum is 53.

The square root of 87836993 is about 9372.1391901742. The cubic root of 87836993 is about 444.5212087243.

The spelling of 87836993 in words is "eighty-seven million, eight hundred thirty-six thousand, nine hundred ninety-three".