91709248820 has 48 divisors (see below), whose sum is σ = 220509222528. Its totient is φ = 31385024640.

The previous prime is 91709248817. The next prime is 91709248859. The reversal of 91709248820 is 2884290719.

It is a congruent number.

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, 529682 + ... + 681161.

It is an arithmetic number, because the mean of its divisors is an integer number (4593942136).

Almost surely, 2^91709248820 is an apocalyptic number.

It is an amenable number.

91709248820 is an abundant number, since it is smaller than the sum of its proper divisors (128799973708).

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

91709248820 is a wasteful number, since it uses less digits than its factorization.

91709248820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1211400 (or 1211398 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 50.

The spelling of 91709248820 in words is "ninety-one billion, seven hundred nine million, two hundred forty-eight thousand, eight hundred twenty".