91768 has 8 divisors (see below), whose sum is σ = 172080. Its totient is φ = 45880.

The previous prime is 91757. The next prime is 91771. The reversal of 91768 is 86719.

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

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

91768 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, 5728 + ... + 5743.

It is an arithmetic number, because the mean of its divisors is an integer number (21510).

2⁹¹⁷⁶⁸ is an apocalyptic number.

It is an amenable number.

91768 is a deficient number, since it is larger than the sum of its proper divisors (80312).

91768 is a wasteful number, since it uses less digits than its factorization.

91768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11477 (or 11473 counting only the distinct ones).

The product of its digits is 3024, while the sum is 31.

The square root of 91768 is about 302.9323356791. The cubic root of 91768 is about 45.1055956400.

The spelling of 91768 in words is "ninety-one thousand, seven hundred sixty-eight".