91028236 has 24 divisors (see below), whose sum is σ = 172704224. Its totient is φ = 41731200.

The previous prime is 91028213. The next prime is 91028239. The reversal of 91028236 is 63282019.

It is a super-2 number, since 2×91028236² = 16572279498543392, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91028198 and 91028207.

It is not an unprimeable number, because it can be changed into a prime (91028239) 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, 2056 + ... + 13648.

Almost surely, 2^91028236 is an apocalyptic number.

It is an amenable number.

91028236 is a deficient number, since it is larger than the sum of its proper divisors (81675988).

91028236 is a wasteful number, since it uses less digits than its factorization.

91028236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11761 (or 11759 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 91028236 is about 9540.8718679165. The cubic root of 91028236 is about 449.8406612825.

The spelling of 91028236 in words is "ninety-one million, twenty-eight thousand, two hundred thirty-six".