91263808 has 56 divisors (see below), whose sum is σ = 186739784. Its totient is φ = 44236800.

The previous prime is 91263791. The next prime is 91263829. The reversal of 91263808 is 80836219.

It can be written as a sum of positive squares in 4 ways, for example, as 3504384 + 87759424 = 1872^2 + 9368^2 .

It is a congruent number.

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, 378568 + ... + 378808.

It is an arithmetic number, because the mean of its divisors is an integer number (3334639).

Almost surely, 2^91263808 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 91263808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93369892).

91263808 is an abundant number, since it is smaller than the sum of its proper divisors (95475976).

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

91263808 is a wasteful number, since it uses less digits than its factorization.

91263808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411 (or 401 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 91263808 is about 9553.2093036843. The cubic root of 91263808 is about 450.2283746155.

The spelling of 91263808 in words is "ninety-one million, two hundred sixty-three thousand, eight hundred eight".