91006740 has 120 divisors (see below), whose sum is σ = 311506272. Its totient is φ = 22057920.

The previous prime is 91006739. The next prime is 91006753. The reversal of 91006740 is 4760019.

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 39 ways as a sum of consecutive naturals, for example, 15267 + ... + 20373.

Almost surely, 2^91006740 is an apocalyptic number.

91006740 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 91006740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155753136).

91006740 is an abundant number, since it is smaller than the sum of its proper divisors (220499532).

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

91006740 is a wasteful number, since it uses less digits than its factorization.

91006740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5139 (or 5128 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 91006740 is about 9539.7452796183. The cubic root of 91006740 is about 449.8052490612.

Adding to 91006740 its reverse (4760019), we get a palindrome (95766759).

The spelling of 91006740 in words is "ninety-one million, six thousand, seven hundred forty".