91383728635 has 16 divisors (see below), whose sum is σ = 112479451200. Its totient is φ = 71246181760.

The previous prime is 91383728617. The next prime is 91383728641. The reversal of 91383728635 is 53682738319.

It is not a de Polignac number, because 91383728635 - 2¹⁹ = 91383204347 is a prime.

It is a super-3 number, since 3×91383728635³ (a number of 34 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1117711 + ... + 1196680.

It is an arithmetic number, because the mean of its divisors is an integer number (7029965700).

Almost surely, 2^91383728635 is an apocalyptic number.

91383728635 is a deficient number, since it is larger than the sum of its proper divisors (21095722565).

91383728635 is a wasteful number, since it uses less digits than its factorization.

91383728635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2314598.

The product of its digits is 6531840, while the sum is 55.

The spelling of 91383728635 in words is "ninety-one billion, three hundred eighty-three million, seven hundred twenty-eight thousand, six hundred thirty-five".