91588086640 has 40 divisors (see below), whose sum is σ = 212957285040. Its totient is φ = 36632656896.

The previous prime is 91588086599. The next prime is 91588086649. The reversal of 91588086640 is 4668088519.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×91588086640² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91588086649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1443096 + ... + 1505224.

It is an arithmetic number, because the mean of its divisors is an integer number (5323932126).

Almost surely, 2^91588086640 is an apocalyptic number.

It is an amenable number.

91588086640 is an abundant number, since it is smaller than the sum of its proper divisors (121369198400).

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

91588086640 is a wasteful number, since it uses less digits than its factorization.

91588086640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80569 (or 80563 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 55.

The spelling of 91588086640 in words is "ninety-one billion, five hundred eighty-eight million, eighty-six thousand, six hundred forty".