91781712 has 60 divisors (see below), whose sum is σ = 280217184. Its totient is φ = 27812160.

The previous prime is 91781693. The next prime is 91781749. The reversal of 91781712 is 21718719.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 11 ways as a sum of consecutive naturals, for example, 27388 + ... + 30555.

Almost surely, 2^91781712 is an apocalyptic number.

It is an amenable number.

91781712 is an abundant number, since it is smaller than the sum of its proper divisors (188435472).

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

91781712 is a wasteful number, since it uses less digits than its factorization.

91781712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57968 (or 57959 counting only the distinct ones).

The product of its digits is 7056, while the sum is 36.

The square root of 91781712 is about 9580.2772402473. The cubic root of 91781712 is about 451.0784209169.

The spelling of 91781712 in words is "ninety-one million, seven hundred eighty-one thousand, seven hundred twelve".