91036440 has 256 divisors, whose sum is σ = 338688000. Its totient is φ = 21565440.

The previous prime is 91036433. The next prime is 91036453. The reversal of 91036440 is 4463019.

91036440 = 1027² + 1028² + ... + 1106².

91036440 is a `hidden beast` number, since 9 + 10 + 3 + 644 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 938472 + ... + 938568.

It is an arithmetic number, because the mean of its divisors is an integer number (1323000).

Almost surely, 2^91036440 is an apocalyptic number.

91036440 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 91036440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169344000).

91036440 is an abundant number, since it is smaller than the sum of its proper divisors (247651560).

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

91036440 is a wasteful number, since it uses less digits than its factorization.

91036440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 91036440 is about 9541.3017979729. The cubic root of 91036440 is about 449.8541749719.

Adding to 91036440 its reverse (4463019), we get a palindrome (95499459).

The spelling of 91036440 in words is "ninety-one million, thirty-six thousand, four hundred forty".