87991586 has 8 divisors (see below), whose sum is σ = 132102684. Its totient is φ = 43957360.

The previous prime is 87991577. The next prime is 87991591. The reversal of 87991586 is 68519978.

It can be written as a sum of positive squares in 2 ways, for example, as 57532225 + 30459361 = 7585^2 + 5519^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16265 + ... + 20988.

Almost surely, 2^87991586 is an apocalyptic number.

87991586 is a deficient number, since it is larger than the sum of its proper divisors (44111098).

87991586 is a wasteful number, since it uses less digits than its factorization.

87991586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38436.

The product of its digits is 1088640, while the sum is 53.

The square root of 87991586 is about 9380.3830412196. The cubic root of 87991586 is about 444.7818414738.

The spelling of 87991586 in words is "eighty-seven million, nine hundred ninety-one thousand, five hundred eighty-six".