91065228 has 48 divisors (see below), whose sum is σ = 224480256. Its totient is φ = 28687680.

The previous prime is 91065217. The next prime is 91065229. The reversal of 91065228 is 82256019.

It is not an unprimeable number, because it can be changed into a prime (91065229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13150 + ... + 18842.

It is an arithmetic number, because the mean of its divisors is an integer number (4676672).

Almost surely, 2^91065228 is an apocalyptic number.

It is an amenable number.

91065228 is an abundant number, since it is smaller than the sum of its proper divisors (133415028).

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

91065228 is a wasteful number, since it uses less digits than its factorization.

91065228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5774 (or 5772 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 91065228 is about 9542.8102779003. The cubic root of 91065228 is about 449.9015883562.

The spelling of 91065228 in words is "ninety-one million, sixty-five thousand, two hundred twenty-eight".