86644 has 6 divisors (see below), whose sum is σ = 151634. Its totient is φ = 43320.

The previous prime is 86629. The next prime is 86677. The reversal of 86644 is 44668.

It can be written as a sum of positive squares in only one way, i.e., 67600 + 19044 = 260^2 + 138^2 .

It is a nialpdrome in base 10.

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, 10827 + ... + 10834.

2⁸⁶⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

86644 is a deficient number, since it is larger than the sum of its proper divisors (64990).

86644 is a wasteful number, since it uses less digits than its factorization.

86644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21665 (or 21663 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The square root of 86644 is about 294.3535289410. The cubic root of 86644 is about 44.2499547809.

It can be divided in two parts, 8664 and 4, that added together give a palindrome (8668).

The spelling of 86644 in words is "eighty-six thousand, six hundred forty-four".