86638 has 4 divisors (see below), whose sum is σ = 129960. Its totient is φ = 43318.

The previous prime is 86629. The next prime is 86677. The reversal of 86638 is 83668.

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

It is a super-2 number, since 2×86638² = 15012286088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

86638 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21658 + ... + 21661.

It is an arithmetic number, because the mean of its divisors is an integer number (32490).

2⁸⁶⁶³⁸ is an apocalyptic number.

86638 is a deficient number, since it is larger than the sum of its proper divisors (43322).

86638 is a wasteful number, since it uses less digits than its factorization.

86638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43321.

The product of its digits is 6912, while the sum is 31.

The square root of 86638 is about 294.3433369383. The cubic root of 86638 is about 44.2489333374.

The spelling of 86638 in words is "eighty-six thousand, six hundred thirty-eight".