91224328 has 32 divisors (see below), whose sum is σ = 188496000. Its totient is φ = 41122368.

The previous prime is 91224323. The next prime is 91224337. The reversal of 91224328 is 82342219.

It is a self number, because there is not a number n which added to its sum of digits gives 91224328.

It is not an unprimeable number, because it can be changed into a prime (91224323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5728 + ... + 14671.

It is an arithmetic number, because the mean of its divisors is an integer number (5890500).

Almost surely, 2^91224328 is an apocalyptic number.

It is an amenable number.

91224328 is an abundant number, since it is smaller than the sum of its proper divisors (97271672).

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

91224328 is a wasteful number, since it uses less digits than its factorization.

91224328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20461 (or 20457 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 91224328 is about 9551.1427588535. The cubic root of 91224328 is about 450.1634435095.

The spelling of 91224328 in words is "ninety-one million, two hundred twenty-four thousand, three hundred twenty-eight".