91043568 has 480 divisors, whose sum is σ = 366405120. Its totient is φ = 21288960.

The previous prime is 91043539. The next prime is 91043581. The reversal of 91043568 is 86534019.

91043568 is a `hidden beast` number, since 91 + 0 + 4 + 3 + 568 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 3958405 + ... + 3958427.

It is an arithmetic number, because the mean of its divisors is an integer number (763344).

Almost surely, 2^91043568 is an apocalyptic number.

91043568 is a gapful number since it is divisible by the number (98) 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 91043568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183202560).

91043568 is an abundant number, since it is smaller than the sum of its proper divisors (275361552).

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

91043568 is a wasteful number, since it uses less digits than its factorization.

91043568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 91043568 is about 9541.6753245958. The cubic root of 91043568 is about 449.8659156070.

The spelling of 91043568 in words is "ninety-one million, forty-three thousand, five hundred sixty-eight".