91789740 has 144 divisors (see below), whose sum is σ = 332287200. Its totient is φ = 20974464.

The previous prime is 91789679. The next prime is 91789751. The reversal of 91789740 is 4798719.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a plaindrome in base 16.

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, 24726 + ... + 28194.

It is an arithmetic number, because the mean of its divisors is an integer number (2307550).

Almost surely, 2^91789740 is an apocalyptic number.

91789740 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91789740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166143600).

91789740 is an abundant number, since it is smaller than the sum of its proper divisors (240497460).

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

91789740 is a wasteful number, since it uses less digits than its factorization.

91789740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3501 (or 3486 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 91789740 is about 9580.6962168728. The cubic root of 91789740 is about 451.0915722369.

It can be divided in two parts, 91789 and 740, that added together give a palindrome (92529).

The spelling of 91789740 in words is "ninety-one million, seven hundred eighty-nine thousand, seven hundred forty".