86991936 has 56 divisors (see below), whose sum is σ = 231123744. Its totient is φ = 28876800.

The previous prime is 86991913. The next prime is 86991977. The reversal of 86991936 is 63919968.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 53536 + ... + 55136.

Almost surely, 2^86991936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 86991936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115561872).

86991936 is an abundant number, since it is smaller than the sum of its proper divisors (144131808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

86991936 is a wasteful number, since it uses less digits than its factorization.

86991936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1899 (or 1889 counting only the distinct ones).

The product of its digits is 629856, while the sum is 51.

The square root of 86991936 is about 9326.9467672974. The cubic root of 86991936 is about 443.0910713372.

The spelling of 86991936 in words is "eighty-six million, nine hundred ninety-one thousand, nine hundred thirty-six".