68031808 has 28 divisors (see below), whose sum is σ = 145387060. Its totient is φ = 31398912.

The previous prime is 68031797. The next prime is 68031829. The reversal of 68031808 is 80813086.

It can be written as a sum of positive squares in 2 ways, for example, as 9784384 + 58247424 = 3128^2 + 7632^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40053 + ... + 41716.

It is an arithmetic number, because the mean of its divisors is an integer number (5192395).

Almost surely, 2^68031808 is an apocalyptic number.

It is an amenable number.

68031808 is an abundant number, since it is smaller than the sum of its proper divisors (77355252).

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

68031808 is a wasteful number, since it uses less digits than its factorization.

68031808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81794 (or 81784 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 68031808 is about 8248.1396690405. The cubic root of 68031808 is about 408.2291420778.

The spelling of 68031808 in words is "sixty-eight million, thirty-one thousand, eight hundred eight".