91709608782 has 32 divisors (see below), whose sum is σ = 200131277184. Its totient is φ = 27785570400.

The previous prime is 91709608769. The next prime is 91709608799. The reversal of 91709608782 is 28780690719.

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, 231057 + ... + 486627.

It is an arithmetic number, because the mean of its divisors is an integer number (6254102412).

Almost surely, 2^91709608782 is an apocalyptic number.

91709608782 is an abundant number, since it is smaller than the sum of its proper divisors (108421668402).

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

91709608782 is a wasteful number, since it uses less digits than its factorization.

91709608782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261024.

The product of its (nonzero) digits is 3048192, while the sum is 57.

The spelling of 91709608782 in words is "ninety-one billion, seven hundred nine million, six hundred eight thousand, seven hundred eighty-two".