91297228 has 24 divisors (see below), whose sum is σ = 174588624. Its totient is φ = 41428800.

The previous prime is 91297187. The next prime is 91297229. The reversal of 91297228 is 82279219.

It is not an unprimeable number, because it can be changed into a prime (91297229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31938 + ... + 34678.

It is an arithmetic number, because the mean of its divisors is an integer number (7274526).

Almost surely, 2^91297228 is an apocalyptic number.

It is an amenable number.

91297228 is a deficient number, since it is larger than the sum of its proper divisors (83291396).

91297228 is a wasteful number, since it uses less digits than its factorization.

91297228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3513 (or 3511 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The square root of 91297228 is about 9554.9582939958. The cubic root of 91297228 is about 450.2833244593.

Subtracting from 91297228 its reverse (82279219), we obtain a square (9018009 = 3003²).

The spelling of 91297228 in words is "ninety-one million, two hundred ninety-seven thousand, two hundred twenty-eight".