86781118 has 4 divisors (see below), whose sum is σ = 130171680. Its totient is φ = 43390558.

The previous prime is 86781109. The next prime is 86781127. The reversal of 86781118 is 81118768.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (86781109) and next prime (86781127).

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21695278 + ... + 21695281.

It is an arithmetic number, because the mean of its divisors is an integer number (32542920).

Almost surely, 2^86781118 is an apocalyptic number.

86781118 is a deficient number, since it is larger than the sum of its proper divisors (43390562).

86781118 is a wasteful number, since it uses less digits than its factorization.

86781118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43390561.

The product of its digits is 21504, while the sum is 40.

The square root of 86781118 is about 9315.6383570854. The cubic root of 86781118 is about 442.7328498819.

The spelling of 86781118 in words is "eighty-six million, seven hundred eighty-one thousand, one hundred eighteen".