91943808 has 64 divisors (see below), whose sum is σ = 266440320. Its totient is φ = 27860480.

The previous prime is 91943807. The next prime is 91943821. The reversal of 91943808 is 80834919.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 91943808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91943807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6660 + ... + 15107.

It is an arithmetic number, because the mean of its divisors is an integer number (4163130).

Almost surely, 2^91943808 is an apocalyptic number.

It is an amenable number.

91943808 is an abundant number, since it is smaller than the sum of its proper divisors (174496512).

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

91943808 is a wasteful number, since it uses less digits than its factorization.

91943808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21795 (or 21783 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 91943808 is about 9588.7333887224. The cubic root of 91943808 is about 451.3438151284.

Subtracting from 91943808 its reverse (80834919), we obtain a square (11108889 = 3333²).

The spelling of 91943808 in words is "ninety-one million, nine hundred forty-three thousand, eight hundred eight".