91613856 has 48 divisors (see below), whose sum is σ = 243891648. Its totient is φ = 30105600.

The previous prime is 91613831. The next prime is 91613861. The reversal of 91613856 is 65831619.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×91613856² = 16786197222377472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96 + ... + 13536.

It is an arithmetic number, because the mean of its divisors is an integer number (5081076).

Almost surely, 2^91613856 is an apocalyptic number.

91613856 is a gapful number since it is divisible by the number (96) 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 91613856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121945824).

91613856 is an abundant number, since it is smaller than the sum of its proper divisors (152277792).

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

91613856 is a wasteful number, since it uses less digits than its factorization.

91613856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13525 (or 13517 counting only the distinct ones).

The product of its digits is 38880, while the sum is 39.

The square root of 91613856 is about 9571.5127331055. The cubic root of 91613856 is about 450.8032665212.

The spelling of 91613856 in words is "ninety-one million, six hundred thirteen thousand, eight hundred fifty-six".