86782 has 4 divisors (see below), whose sum is σ = 130176. Its totient is φ = 43390.

The previous prime is 86771. The next prime is 86783. The reversal of 86782 is 28768.

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

It is a super-2 number, since 2×86782² = 15062231048, which contains 22 as substring.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86783) by changing a digit.

86782 is an untouchable number, because it is not equal to the sum of proper divisors of any 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, 21694 + ... + 21697.

It is an arithmetic number, because the mean of its divisors is an integer number (32544).

2⁸⁶⁷⁸² is an apocalyptic number.

86782 is a deficient number, since it is larger than the sum of its proper divisors (43394).

86782 is a wasteful number, since it uses less digits than its factorization.

86782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43393.

The product of its digits is 5376, while the sum is 31.

The square root of 86782 is about 294.5878476788. The cubic root of 86782 is about 44.2734349782.

Subtracting from 86782 its product of digits (5376), we obtain a triangular number (81406 = T₄₀₃).

It can be divided in two parts, 867 and 82, that added together give a palindrome (949).

The spelling of 86782 in words is "eighty-six thousand, seven hundred eighty-two".