91380744788 has 12 divisors (see below), whose sum is σ = 162933592500. Its totient is φ = 44828289792.

The previous prime is 91380744787. The next prime is 91380744811. The reversal of 91380744788 is 88744708319.

It can be written as a sum of positive squares in 2 ways, for example, as 77140618564 + 14240126224 = 277742^2 + 119332^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91380744781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215520413 + ... + 215520836.

It is an arithmetic number, because the mean of its divisors is an integer number (13577799375).

Almost surely, 2^91380744788 is an apocalyptic number.

It is an amenable number.

91380744788 is a deficient number, since it is larger than the sum of its proper divisors (71552847712).

91380744788 is a wasteful number, since it uses less digits than its factorization.

91380744788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431041306 (or 431041304 counting only the distinct ones).

The product of its (nonzero) digits is 10838016, while the sum is 59.

The spelling of 91380744788 in words is "ninety-one billion, three hundred eighty million, seven hundred forty-four thousand, seven hundred eighty-eight".