91919081880 has 160 divisors (see below), whose sum is σ = 311838809040. Its totient is φ = 24282581760.

The previous prime is 91919081873. The next prime is 91919081941. The reversal of 91919081880 is 8818091919.

It is a super-2 number, since 2×91919081880² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

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, 214110 + ... + 479250.

Almost surely, 2^91919081880 is an apocalyptic number.

91919081880 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91919081880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155919404520).

91919081880 is an abundant number, since it is smaller than the sum of its proper divisors (219919727160).

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

91919081880 is a wasteful number, since it uses less digits than its factorization.

91919081880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265271 (or 265258 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 54.

The spelling of 91919081880 in words is "ninety-one billion, nine hundred nineteen million, eighty-one thousand, eight hundred eighty".