91028859 has 8 divisors (see below), whose sum is σ = 122506560. Its totient is φ = 60118536.

The previous prime is 91028831. The next prime is 91028879. The reversal of 91028859 is 95882019.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91028859 - 2⁵ = 91028827 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91028859.

It is not an unprimeable number, because it can be changed into a prime (91028809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141469 + ... + 142110.

It is an arithmetic number, because the mean of its divisors is an integer number (15313320).

Almost surely, 2^91028859 is an apocalyptic number.

91028859 is a deficient number, since it is larger than the sum of its proper divisors (31477701).

91028859 is a wasteful number, since it uses less digits than its factorization.

91028859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283689.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 91028859 is about 9540.9045168684. The cubic root of 91028859 is about 449.8416875212.

The spelling of 91028859 in words is "ninety-one million, twenty-eight thousand, eight hundred fifty-nine".