91888 has 10 divisors (see below), whose sum is σ = 178064. Its totient is φ = 45936.

The previous prime is 91873. The next prime is 91909. The reversal of 91888 is 88819.

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, 2856 + ... + 2887.

2⁹¹⁸⁸⁸ is an apocalyptic number.

It is an amenable number.

91888 is a deficient number, since it is larger than the sum of its proper divisors (86176).

91888 is a wasteful number, since it uses less digits than its factorization.

91888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5751 (or 5745 counting only the distinct ones).

The product of its digits is 4608, while the sum is 34.

The square root of 91888 is about 303.1303350046. The cubic root of 91888 is about 45.1252477842.

It can be divided in two parts, 91 and 888, that multiplied together give a palindrome (80808).

The spelling of 91888 in words is "ninety-one thousand, eight hundred eighty-eight".