91108944 has 60 divisors (see below), whose sum is σ = 257879700. Its totient is φ = 30024192.

The previous prime is 91108943. The next prime is 91108949. The reversal of 91108944 is 44980119.

It can be written as a sum of positive squares in 2 ways, for example, as 15210000 + 75898944 = 3900^2 + 8712^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 91108899 and 91108908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91108943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9262 + ... + 16370.

It is an arithmetic number, because the mean of its divisors is an integer number (4297995).

Almost surely, 2^91108944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91108944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128939850).

91108944 is an abundant number, since it is smaller than the sum of its proper divisors (166770756).

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

91108944 is a wasteful number, since it uses less digits than its factorization.

91108944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7212 (or 7203 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 91108944 is about 9545.1005233051. The cubic root of 91108944 is about 449.9735688179.

The spelling of 91108944 in words is "ninety-one million, one hundred eight thousand, nine hundred forty-four".