91268443128 has 32 divisors (see below), whose sum is σ = 230303554560. Its totient is φ = 30138488160.

The previous prime is 91268443121. The next prime is 91268443139. The reversal of 91268443128 is 82134486219.

It is a super-2 number, since 2×91268443128² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91268443121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17767768 + ... + 17772903.

It is an arithmetic number, because the mean of its divisors is an integer number (7196986080).

Almost surely, 2^91268443128 is an apocalyptic number.

It is an amenable number.

91268443128 is an abundant number, since it is smaller than the sum of its proper divisors (139035111432).

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

91268443128 is a wasteful number, since it uses less digits than its factorization.

91268443128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35540787 (or 35540783 counting only the distinct ones).

The product of its digits is 663552, while the sum is 48.

The spelling of 91268443128 in words is "ninety-one billion, two hundred sixty-eight million, four hundred forty-three thousand, one hundred twenty-eight".