91081608 has 16 divisors (see below), whose sum is σ = 227704080. Its totient is φ = 30360528.

The previous prime is 91081607. The next prime is 91081619. The reversal of 91081608 is 80618019.

It is not an unprimeable number, because it can be changed into a prime (91081607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1897510 + ... + 1897557.

It is an arithmetic number, because the mean of its divisors is an integer number (14231505).

Almost surely, 2^91081608 is an apocalyptic number.

It is an amenable number.

91081608 is an abundant number, since it is smaller than the sum of its proper divisors (136622472).

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

91081608 is a wasteful number, since it uses less digits than its factorization.

91081608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3795076 (or 3795072 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 91081608 is about 9543.6684770585. The cubic root of 91081608 is about 449.9285614991.

The spelling of 91081608 in words is "ninety-one million, eighty-one thousand, six hundred eight".