91444400 has 30 divisors (see below), whose sum is σ = 219696132. Its totient is φ = 36577600.

The previous prime is 91444393. The next prime is 91444403. The reversal of 91444400 is 444419.

It is a self number, because there is not a number n which added to its sum of digits gives 91444400.

It is not an unprimeable number, because it can be changed into a prime (91444403) 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 5 ways as a sum of consecutive naturals, for example, 113906 + ... + 114705.

Almost surely, 2^91444400 is an apocalyptic number.

It is an amenable number.

91444400 is an abundant number, since it is smaller than the sum of its proper divisors (128251732).

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

91444400 is a wasteful number, since it uses less digits than its factorization.

91444400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228629 (or 228618 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 91444400 is about 9562.6565346665. The cubic root of 91444400 is about 450.5251482326.

Adding to 91444400 its reverse (444419), we get a palindrome (91888819).

The spelling of 91444400 in words is "ninety-one million, four hundred forty-four thousand, four hundred".