91318080 has 224 divisors, whose sum is σ = 337084416. Its totient is φ = 20514816.

The previous prime is 91318043. The next prime is 91318081. The reversal of 91318080 is 8081319.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91318081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 718977 + ... + 719103.

Almost surely, 2^91318080 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 91318080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168542208).

91318080 is an abundant number, since it is smaller than the sum of its proper divisors (245766336).

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

91318080 is a wasteful number, since it uses less digits than its factorization.

91318080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 91318080 is about 9556.0493929238. The cubic root of 91318080 is about 450.3176029486.

Adding to 91318080 its reverse (8081319), we get a palindrome (99399399).

The spelling of 91318080 in words is "ninety-one million, three hundred eighteen thousand, eighty".