68409904 has 40 divisors (see below), whose sum is σ = 143629200. Its totient is φ = 31438848.

The previous prime is 68409893. The next prime is 68409911. The reversal of 68409904 is 40990486.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8772 + ... + 14620.

It is an arithmetic number, because the mean of its divisors is an integer number (3590730).

Almost surely, 2^68409904 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 68409904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71814600).

68409904 is an abundant number, since it is smaller than the sum of its proper divisors (75219296).

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

68409904 is a wasteful number, since it uses less digits than its factorization.

68409904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5917 (or 5911 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 68409904 is about 8271.0279893131. The cubic root of 68409904 is about 408.9840083178.

The spelling of 68409904 in words is "sixty-eight million, four hundred nine thousand, nine hundred four".