86817818 has 4 divisors (see below), whose sum is σ = 130226730. Its totient is φ = 43408908.

The previous prime is 86817791. The next prime is 86817839. The reversal of 86817818 is 81871868.

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., 86731969 + 85849 = 9313^2 + 293^2 .

It is a super-2 number, since 2×86817818² = 15074667044562248, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 21704453 + ... + 21704456.

Almost surely, 2^86817818 is an apocalyptic number.

86817818 is a deficient number, since it is larger than the sum of its proper divisors (43408912).

86817818 is a wasteful number, since it uses less digits than its factorization.

86817818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43408911.

The product of its digits is 172032, while the sum is 47.

The square root of 86817818 is about 9317.6079548348. The cubic root of 86817818 is about 442.7952521111.

The spelling of 86817818 in words is "eighty-six million, eight hundred seventeen thousand, eight hundred eighteen".