91709638750 has 20 divisors (see below), whose sum is σ = 171900549216. Its totient is φ = 36683855000.

The previous prime is 91709638739. The next prime is 91709638753. The reversal of 91709638750 is 5783690719.

It is a junction number, because it is equal to n+sod(n) for n = 91709638691 and 91709638700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91709638753) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 36682606 + ... + 36685105.

Almost surely, 2^91709638750 is an apocalyptic number.

91709638750 is a deficient number, since it is larger than the sum of its proper divisors (80190910466).

91709638750 is an equidigital number, since it uses as much as digits as its factorization.

91709638750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73367733 (or 73367718 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 55.

The spelling of 91709638750 in words is "ninety-one billion, seven hundred nine million, six hundred thirty-eight thousand, seven hundred fifty".