91743240 has 128 divisors (see below), whose sum is σ = 292118400. Its totient is φ = 23009280.

The previous prime is 91743227. The next prime is 91743241. The reversal of 91743240 is 4234719.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 91743198 and 91743207.

It is not an unprimeable number, because it can be changed into a prime (91743241) 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 31 ways as a sum of consecutive naturals, for example, 142359 + ... + 143001.

It is an arithmetic number, because the mean of its divisors is an integer number (2282175).

Almost surely, 2^91743240 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 91743240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146059200).

91743240 is an abundant number, since it is smaller than the sum of its proper divisors (200375160).

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

91743240 is a wasteful number, since it uses less digits than its factorization.

91743240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727 (or 723 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 91743240 is about 9578.2691547064. The cubic root of 91743240 is about 451.0153861579.

Adding to 91743240 its reverse (4234719), we get a palindrome (95977959).

The spelling of 91743240 in words is "ninety-one million, seven hundred forty-three thousand, two hundred forty".