91234560 has 144 divisors (see below), whose sum is σ = 304343424. Its totient is φ = 23248896.

The previous prime is 91234547. The next prime is 91234603. The reversal of 91234560 is 6543219.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87804 + ... + 88836.

It is an arithmetic number, because the mean of its divisors is an integer number (2113496).

Almost surely, 2^91234560 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 91234560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152171712).

91234560 is an abundant number, since it is smaller than the sum of its proper divisors (213108864).

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

91234560 is a wasteful number, since it uses less digits than its factorization.

91234560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080 (or 1066 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 91234560 is about 9551.6783865455. The cubic root of 91234560 is about 450.1802734504.

Adding to 91234560 its reverse (6543219), we get a palindrome (97777779).

The spelling of 91234560 in words is "ninety-one million, two hundred thirty-four thousand, five hundred sixty".