91028855 has 8 divisors (see below), whose sum is σ = 109286064. Its totient is φ = 72788800.

The previous prime is 91028831. The next prime is 91028879. The reversal of 91028855 is 55882019.

It is an interprime number because it is at equal distance from previous prime (91028831) and next prime (91028879).

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

It is not a de Polignac number, because 91028855 - 2¹⁶ = 90963319 is a prime.

It is a super-2 number, since 2×91028855² = 16572504885222050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 17060 + ... + 21750.

It is an arithmetic number, because the mean of its divisors is an integer number (13660758).

Almost surely, 2^91028855 is an apocalyptic number.

91028855 is a deficient number, since it is larger than the sum of its proper divisors (18257209).

91028855 is a wasteful number, since it uses less digits than its factorization.

91028855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8577.

The product of its (nonzero) digits is 28800, while the sum is 38.

The square root of 91028855 is about 9540.9043072447. The cubic root of 91028855 is about 449.8416809322.

The spelling of 91028855 in words is "ninety-one million, twenty-eight thousand, eight hundred fifty-five".