91278080 has 72 divisors (see below), whose sum is σ = 226270800. Its totient is φ = 35237888.

The previous prime is 91278059. The next prime is 91278091. The reversal of 91278080 is 8087219.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 91278080.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35891 + ... + 38349.

It is an arithmetic number, because the mean of its divisors is an integer number (3142650).

Almost surely, 2^91278080 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91278080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113135400).

91278080 is an abundant number, since it is smaller than the sum of its proper divisors (134992720).

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

91278080 is a wasteful number, since it uses less digits than its factorization.

91278080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2509 (or 2495 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 91278080 is about 9553.9562485915. The cubic root of 91278080 is about 450.2518425691.

The spelling of 91278080 in words is "ninety-one million, two hundred seventy-eight thousand, eighty".