91471265280 has 960 divisors, whose sum is σ = 353902348800. Its totient is φ = 22574039040.

The previous prime is 91471265267. The next prime is 91471265317. The reversal of 91471265280 is 8256217419.

It is a tau number, because it is divible by the number of its divisors (960).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 839185866 + ... + 839185974.

It is an arithmetic number, because the mean of its divisors is an integer number (368648280).

Almost surely, 2^91471265280 is an apocalyptic number.

91471265280 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 91471265280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176951174400).

91471265280 is an abundant number, since it is smaller than the sum of its proper divisors (262431083520).

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

91471265280 is a wasteful number, since it uses less digits than its factorization.

91471265280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 91471265280 in words is "ninety-one billion, four hundred seventy-one million, two hundred sixty-five thousand, two hundred eighty".