91671808 has 72 divisors (see below), whose sum is σ = 197205120. Its totient is φ = 42393600.

The previous prime is 91671799. The next prime is 91671809. The reversal of 91671808 is 80817619.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91671809) 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, 228408 + ... + 228808.

It is an arithmetic number, because the mean of its divisors is an integer number (2738960).

Almost surely, 2^91671808 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 91671808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98602560).

91671808 is an abundant number, since it is smaller than the sum of its proper divisors (105533312).

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

91671808 is a wasteful number, since it uses less digits than its factorization.

91671808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483 (or 469 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 91671808 is about 9574.5395711752. The cubic root of 91671808 is about 450.8983010693.

The spelling of 91671808 in words is "ninety-one million, six hundred seventy-one thousand, eight hundred eight".