91029728 has 24 divisors (see below), whose sum is σ = 179448192. Its totient is φ = 45455616.

The previous prime is 91029727. The next prime is 91029761. The reversal of 91029728 is 82792019.

It is a super-2 number, since 2×91029728² = 16572822759507968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91029691 and 91029700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91029727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33476 + ... + 36092.

It is an arithmetic number, because the mean of its divisors is an integer number (7477008).

Almost surely, 2^91029728 is an apocalyptic number.

It is an amenable number.

91029728 is a deficient number, since it is larger than the sum of its proper divisors (88418464).

91029728 is a wasteful number, since it uses less digits than its factorization.

91029728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3714 (or 3706 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 91029728 is about 9540.9500575152. The cubic root of 91029728 is about 449.8431189763.

The spelling of 91029728 in words is "ninety-one million, twenty-nine thousand, seven hundred twenty-eight".