91864 has 8 divisors (see below), whose sum is σ = 172260. Its totient is φ = 45928.

The previous prime is 91841. The next prime is 91867. The reversal of 91864 is 46819.

It is a tau number, because it is divible by the number of its divisors (8).

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 (91867) by changing a digit.

91864 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, 5734 + ... + 5749.

2⁹¹⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

91864 is a deficient number, since it is larger than the sum of its proper divisors (80396).

91864 is a wasteful number, since it uses less digits than its factorization.

91864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11489 (or 11485 counting only the distinct ones).

The product of its digits is 1728, while the sum is 28.

The square root of 91864 is about 303.0907454872. The cubic root of 91864 is about 45.1213187248.

The spelling of 91864 in words is "ninety-one thousand, eight hundred sixty-four".