91599816 has 192 divisors, whose sum is σ = 297622080. Its totient is φ = 23224320.

The previous prime is 91599803. The next prime is 91599839. The reversal of 91599816 is 61899519.

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, 944280 + ... + 944376.

It is an arithmetic number, because the mean of its divisors is an integer number (1550115).

Almost surely, 2^91599816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91599816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148811040).

91599816 is an abundant number, since it is smaller than the sum of its proper divisors (206022264).

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

91599816 is a wasteful number, since it uses less digits than its factorization.

91599816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 193 counting only the distinct ones).

The product of its digits is 174960, while the sum is 48.

The square root of 91599816 is about 9570.7792786168. The cubic root of 91599816 is about 450.7802365215.

The spelling of 91599816 in words is "ninety-one million, five hundred ninety-nine thousand, eight hundred sixteen".