86640244 has 12 divisors (see below), whose sum is σ = 151690084. Its totient is φ = 43300224.

The previous prime is 86640193. The next prime is 86640251. The reversal of 86640244 is 44204668.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 83356900 + 3283344 = 9130^2 + 1812^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 9502 + ... + 16234.

Almost surely, 2^86640244 is an apocalyptic number.

It is an amenable number.

86640244 is a deficient number, since it is larger than the sum of its proper divisors (65049840).

86640244 is a wasteful number, since it uses less digits than its factorization.

86640244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9954 (or 9952 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 34.

The square root of 86640244 is about 9308.0741294856. The cubic root of 86640244 is about 442.4931536281.

The spelling of 86640244 in words is "eighty-six million, six hundred forty thousand, two hundred forty-four".