91404240 has 160 divisors (see below), whose sum is σ = 307587456. Its totient is φ = 22364160.

The previous prime is 91404233. The next prime is 91404251. The reversal of 91404240 is 4240419.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 91404240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 175180 + ... + 175700.

Almost surely, 2^91404240 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 91404240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153793728).

91404240 is an abundant number, since it is smaller than the sum of its proper divisors (216183216).

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

91404240 is a wasteful number, since it uses less digits than its factorization.

91404240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597 (or 591 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 91404240 is about 9560.5564691602. The cubic root of 91404240 is about 450.4591856029.

Adding to 91404240 its reverse (4240419), we get a palindrome (95644659).

The spelling of 91404240 in words is "ninety-one million, four hundred four thousand, two hundred forty".