91789698 has 256 divisors, whose sum is σ = 278691840. Its totient is φ = 19353600.

The previous prime is 91789679. The next prime is 91789751. The reversal of 91789698 is 89698719.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2960943 + ... + 2960973.

It is an arithmetic number, because the mean of its divisors is an integer number (1088640).

Almost surely, 2^91789698 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91789698, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139345920).

91789698 is an abundant number, since it is smaller than the sum of its proper divisors (186902142).

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

91789698 is a wasteful number, since it uses less digits than its factorization.

91789698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113.

The product of its digits is 1959552, while the sum is 57.

The square root of 91789698 is about 9580.6940249650. The cubic root of 91789698 is about 451.0915034353.

The spelling of 91789698 in words is "ninety-one million, seven hundred eighty-nine thousand, six hundred ninety-eight".