68409808 has 40 divisors (see below), whose sum is σ = 138205440. Its totient is φ = 32766720.

The previous prime is 68409793. The next prime is 68409821. The reversal of 68409808 is 80890486.

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, 52428 + ... + 53716.

It is an arithmetic number, because the mean of its divisors is an integer number (3455136).

Almost surely, 2^68409808 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 68409808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69102720).

68409808 is an abundant number, since it is smaller than the sum of its proper divisors (69795632).

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

68409808 is a wasteful number, since it uses less digits than its factorization.

68409808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1435 (or 1429 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 68409808 is about 8271.0221859212. The cubic root of 68409808 is about 408.9838170078.

The spelling of 68409808 in words is "sixty-eight million, four hundred nine thousand, eight hundred eight".