91088 has 10 divisors (see below), whose sum is σ = 176514. Its totient is φ = 45536.

The previous prime is 91081. The next prime is 91097. The reversal of 91088 is 88019.

It can be written as a sum of positive squares in only one way, i.e., 61504 + 29584 = 248^2 + 172^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91081) by changing a digit.

91088 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, 2831 + ... + 2862.

2⁹¹⁰⁸⁸ is an apocalyptic number.

It is an amenable number.

91088 is a deficient number, since it is larger than the sum of its proper divisors (85426).

91088 is a wasteful number, since it uses less digits than its factorization.

91088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5701 (or 5695 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 91088 is about 301.8078859142. The cubic root of 91088 is about 44.9939086405.

The spelling of 91088 in words is "ninety-one thousand, eighty-eight".