68107840 has 28 divisors (see below), whose sum is σ = 162182556. Its totient is φ = 27243008.

The previous prime is 68107801. The next prime is 68107843. The reversal of 68107840 is 4870186.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 40144896 + 27962944 = 6336^2 + 5288^2 .

It is a junction number, because it is equal to n+sod(n) for n = 68107796 and 68107805.

It is not an unprimeable number, because it can be changed into a prime (68107843) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 106099 + ... + 106738.

Almost surely, 2^68107840 is an apocalyptic number.

It is an amenable number.

68107840 is an abundant number, since it is smaller than the sum of its proper divisors (94074716).

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

68107840 is a wasteful number, since it uses less digits than its factorization.

68107840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212854 (or 212844 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 68107840 is about 8252.7474213137. The cubic root of 68107840 is about 408.3811637247.

The spelling of 68107840 in words is "sixty-eight million, one hundred seven thousand, eight hundred forty".