7991808 has 120 divisors (see below), whose sum is σ = 23946384. Its totient is φ = 2365440.

The previous prime is 7991803. The next prime is 7991839. The reversal of 7991808 is 8081997.

It is a self number, because there is not a number n which added to its sum of digits gives 7991808.

It is not an unprimeable number, because it can be changed into a prime (7991803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 185835 + ... + 185877.

Almost surely, 2^7991808 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 7991808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11973192).

7991808 is an abundant number, since it is smaller than the sum of its proper divisors (15954576).

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

7991808 is a wasteful number, since it uses less digits than its factorization.

7991808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86 (or 59 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 7991808 is about 2826.9785991408. The cubic root of 7991808 is about 199.9317100184.

The spelling of 7991808 in words is "seven million, nine hundred ninety-one thousand, eight hundred eight".