91644444 has 18 divisors (see below), whose sum is σ = 231656880. Its totient is φ = 30548136.

The previous prime is 91644431. The next prime is 91644451. The reversal of 91644444 is 44444619.

91644444 is a `hidden beast` number, since 9 + 1 + 644 + 4 + 4 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2545679 = 91644444 / (9 + 1 + 6 + 4 + 4 + 4 + 4 + 4).

It is a nude number because it is divisible by every one of its digits.

91644444 is a modest number, since divided by 44444 gives 916 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 91644399 and 91644408.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 1272804 + ... + 1272875.

Almost surely, 2^91644444 is an apocalyptic number.

It is an amenable number.

91644444 is an abundant number, since it is smaller than the sum of its proper divisors (140012436).

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

91644444 is a wasteful number, since it uses less digits than its factorization.

91644444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2545689 (or 2545684 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 91644444 is about 9573.1104663009. The cubic root of 91644444 is about 450.8534322805.

The spelling of 91644444 in words is "ninety-one million, six hundred forty-four thousand, four hundred forty-four".