86644018 has 4 divisors (see below), whose sum is σ = 129966030. Its totient is φ = 43322008.

The previous prime is 86644007. The next prime is 86644021. The reversal of 86644018 is 81044668.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 49519369 + 37124649 = 7037^2 + 6093^2 .

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 as a sum of consecutive naturals, namely, 21661003 + ... + 21661006.

Almost surely, 2^86644018 is an apocalyptic number.

86644018 is a deficient number, since it is larger than the sum of its proper divisors (43322012).

86644018 is a wasteful number, since it uses less digits than its factorization.

86644018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43322011.

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 86644018 is about 9308.2768544989. The cubic root of 86644018 is about 442.4995784519.

The spelling of 86644018 in words is "eighty-six million, six hundred forty-four thousand, eighteen".