91134720 has 216 divisors, whose sum is σ = 328111056. Its totient is φ = 24219648.

The previous prime is 91134707. The next prime is 91134721. The reversal of 91134720 is 2743119.

It is a tau number, because it is divible by the number of its divisors (216).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (91134721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 310894 + ... + 311186.

Almost surely, 2^91134720 is an apocalyptic number.

91134720 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91134720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164055528).

91134720 is an abundant number, since it is smaller than the sum of its proper divisors (236976336).

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

91134720 is an equidigital number, since it uses as much as digits as its factorization.

91134720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 91134720 is about 9546.4506493251. The cubic root of 91134720 is about 450.0159994311.

Adding to 91134720 its reverse (2743119), we get a palindrome (93877839).

The spelling of 91134720 in words is "ninety-one million, one hundred thirty-four thousand, seven hundred twenty".