91228536 has 96 divisors (see below), whose sum is σ = 291532800. Its totient is φ = 25220160.

The previous prime is 91228513. The next prime is 91228541. The reversal of 91228536 is 63582219.

It is a super-3 number, since 3×91228536³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 91228536.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12705 + ... + 18543.

It is an arithmetic number, because the mean of its divisors is an integer number (3036800).

Almost surely, 2^91228536 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 91228536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145766400).

91228536 is an abundant number, since it is smaller than the sum of its proper divisors (200304264).

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

91228536 is a wasteful number, since it uses less digits than its factorization.

91228536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5889 (or 5882 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 91228536 is about 9551.3630440896. The cubic root of 91228536 is about 450.1703651231.

The spelling of 91228536 in words is "ninety-one million, two hundred twenty-eight thousand, five hundred thirty-six".