91644894 has 48 divisors (see below), whose sum is σ = 217676160. Its totient is φ = 27635280.

The previous prime is 91644887. The next prime is 91644907. The reversal of 91644894 is 49844619.

91644894 is a `hidden beast` number, since 9 + 164 + 489 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 43927 + ... + 45965.

It is an arithmetic number, because the mean of its divisors is an integer number (4534920).

Almost surely, 2^91644894 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91644894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108838080).

91644894 is an abundant number, since it is smaller than the sum of its proper divisors (126031266).

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

91644894 is a wasteful number, since it uses less digits than its factorization.

91644894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2285 (or 2282 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 91644894 is about 9573.1339696047. The cubic root of 91644894 is about 450.8541702184.

The spelling of 91644894 in words is "ninety-one million, six hundred forty-four thousand, eight hundred ninety-four".