91856 has 10 divisors (see below), whose sum is σ = 178002. Its totient is φ = 45920.

The previous prime is 91841. The next prime is 91867. The reversal of 91856 is 65819.

It can be written as a sum of positive squares in only one way, i.e., 78400 + 13456 = 280^2 + 116^2 .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 91856.

It is an unprimeable number.

91856 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, 2855 + ... + 2886.

2⁹¹⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

91856 is a deficient number, since it is larger than the sum of its proper divisors (86146).

91856 is a wasteful number, since it uses less digits than its factorization.

91856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5749 (or 5743 counting only the distinct ones).

The product of its digits is 2160, while the sum is 29.

The square root of 91856 is about 303.0775478322. The cubic root of 91856 is about 45.1200088862.

The spelling of 91856 in words is "ninety-one thousand, eight hundred fifty-six".