91644298560 has 336 divisors, whose sum is σ = 337985282880. Its totient is φ = 23374771200.

The previous prime is 91644298541. The next prime is 91644298597. The reversal of 91644298560 is 6589244619.

91644298560 is a `hidden beast` number, since 9 + 16 + 44 + 29 + 8 + 560 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 91644298497 and 91644298506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4560535 + ... + 4580585.

It is an arithmetic number, because the mean of its divisors is an integer number (1005908580).

Almost surely, 2^91644298560 is an apocalyptic number.

91644298560 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 91644298560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168992641440).

91644298560 is an abundant number, since it is smaller than the sum of its proper divisors (246340984320).

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

91644298560 is a wasteful number, since it uses less digits than its factorization.

91644298560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20123 (or 20084 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The spelling of 91644298560 in words is "ninety-one billion, six hundred forty-four million, two hundred ninety-eight thousand, five hundred sixty".