91783521740 has 24 divisors (see below), whose sum is σ = 194653770192. Its totient is φ = 36349908800.

The previous prime is 91783521719. The next prime is 91783521763. The reversal of 91783521740 is 4712538719.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22716674 + ... + 22720713.

It is an arithmetic number, because the mean of its divisors is an integer number (8110573758).

Almost surely, 2^91783521740 is an apocalyptic number.

It is an amenable number.

91783521740 is an abundant number, since it is smaller than the sum of its proper divisors (102870248452).

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

91783521740 is a wasteful number, since it uses less digits than its factorization.

91783521740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45437497 (or 45437495 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 47.

The spelling of 91783521740 in words is "ninety-one billion, seven hundred eighty-three million, five hundred twenty-one thousand, seven hundred forty".