91649844 has 144 divisors (see below), whose sum is σ = 286802880. Its totient is φ = 24261120.

The previous prime is 91649837. The next prime is 91649861. The reversal of 91649844 is 44894619.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 91649844.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 97344 + ... + 98280.

Almost surely, 2^91649844 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 91649844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143401440).

91649844 is an abundant number, since it is smaller than the sum of its proper divisors (195153036).

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

91649844 is a wasteful number, since it uses less digits than its factorization.

91649844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990 (or 985 counting only the distinct ones).

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

The square root of 91649844 is about 9573.3925021384. The cubic root of 91649844 is about 450.8622873753.

The spelling of 91649844 in words is "ninety-one million, six hundred forty-nine thousand, eight hundred forty-four".