91444420 has 48 divisors (see below), whose sum is σ = 200729088. Its totient is φ = 34951680.

The previous prime is 91444417. The next prime is 91444439. The reversal of 91444420 is 2444419.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 50572 + ... + 52348.

It is an arithmetic number, because the mean of its divisors is an integer number (4181856).

Almost surely, 2^91444420 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 91444420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100364544).

91444420 is an abundant number, since it is smaller than the sum of its proper divisors (109284668).

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

91444420 is a wasteful number, since it uses less digits than its factorization.

91444420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1900 (or 1898 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 91444420 is about 9562.6575804010. The cubic root of 91444420 is about 450.5251810777.

Adding to 91444420 its reverse (2444419), we get a palindrome (93888839).

The spelling of 91444420 in words is "ninety-one million, four hundred forty-four thousand, four hundred twenty".