91589975802 has 80 divisors (see below), whose sum is σ = 221898089952. Its totient is φ = 28069092000.

The previous prime is 91589975801. The next prime is 91589975831. The reversal of 91589975802 is 20857998519.

It is a self number, because there is not a number n which added to its sum of digits gives 91589975802.

It is not an unprimeable number, because it can be changed into a prime (91589975801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 441973 + ... + 615239.

Almost surely, 2^91589975802 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91589975802, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110949044976).

91589975802 is an abundant number, since it is smaller than the sum of its proper divisors (130308114150).

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

91589975802 is a wasteful number, since it uses less digits than its factorization.

91589975802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173545 (or 173536 counting only the distinct ones).

The product of its (nonzero) digits is 16329600, while the sum is 63.

The spelling of 91589975802 in words is "ninety-one billion, five hundred eighty-nine million, nine hundred seventy-five thousand, eight hundred two".