91356228 has 48 divisors (see below), whose sum is σ = 237740160. Its totient is φ = 30337632.

The previous prime is 91356227. The next prime is 91356229. The reversal of 91356228 is 82265319.

91356228 is a `hidden beast` number, since 91 + 3 + 562 + 2 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (91356227) and next prime (91356229).

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

It is a junction number, because it is equal to n+sod(n) for n = 91356192 and 91356201.

It is not an unprimeable number, because it can be changed into a prime (91356227) 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, 30201 + ... + 33087.

It is an arithmetic number, because the mean of its divisors is an integer number (4952920).

Almost surely, 2^91356228 is an apocalyptic number.

It is an amenable number.

91356228 is an abundant number, since it is smaller than the sum of its proper divisors (146383932).

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

91356228 is a wasteful number, since it uses less digits than its factorization.

91356228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3193 (or 3185 counting only the distinct ones).

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

The square root of 91356228 is about 9558.0451976332. The cubic root of 91356228 is about 450.3803007347.

Subtracting from 91356228 its reverse (82265319), we obtain a palindrome (9090909).

The spelling of 91356228 in words is "ninety-one million, three hundred fifty-six thousand, two hundred twenty-eight".