91278 has 24 divisors (see below), whose sum is σ = 216216. Its totient is φ = 27600.

The previous prime is 91253. The next prime is 91283. The reversal of 91278 is 87219.

It is a congruent number.

It is an unprimeable number.

91278 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 in 11 ways as a sum of consecutive naturals, for example, 33 + ... + 428.

It is an arithmetic number, because the mean of its divisors is an integer number (9009).

2⁹¹²⁷⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108108).

91278 is an abundant number, since it is smaller than the sum of its proper divisors (124938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91278 is a wasteful number, since it uses less digits than its factorization.

91278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480 (or 477 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 91278 is about 302.1224917149. The cubic root of 91278 is about 45.0251711029.

It can be divided in two parts, 912 and 78, that added together give a triangular number (990 = T₄₄).

The spelling of 91278 in words is "ninety-one thousand, two hundred seventy-eight".