68539904 has 40 divisors (see below), whose sum is σ = 137736720. Its totient is φ = 34072576.

The previous prime is 68539901. The next prime is 68539943. The reversal of 68539904 is 40993586.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68539901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134402 + ... + 134910.

It is an arithmetic number, because the mean of its divisors is an integer number (3443418).

Almost surely, 2^68539904 is an apocalyptic number.

68539904 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68539904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68868360).

68539904 is an abundant number, since it is smaller than the sum of its proper divisors (69196816).

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

68539904 is an equidigital number, since it uses as much as digits as its factorization.

68539904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790 (or 774 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 68539904 is about 8278.8830164461. The cubic root of 68539904 is about 409.2429098071.

The spelling of 68539904 in words is "sixty-eight million, five hundred thirty-nine thousand, nine hundred four".