68017640 has 16 divisors (see below), whose sum is σ = 153039780. Its totient is φ = 27207040.

The previous prime is 68017637. The next prime is 68017679. The reversal of 68017640 is 4671086.

It can be written as a sum of positive squares in 2 ways, for example, as 61371556 + 6646084 = 7834^2 + 2578^2 .

It is a junction number, because it is equal to n+sod(n) for n = 68017597 and 68017606.

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, 850181 + ... + 850260.

Almost surely, 2^68017640 is an apocalyptic number.

It is an amenable number.

68017640 is an abundant number, since it is smaller than the sum of its proper divisors (85022140).

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

68017640 is a wasteful number, since it uses less digits than its factorization.

68017640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700452 (or 1700448 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 68017640 is about 8247.2807639852. The cubic root of 68017640 is about 408.2008014520.

It can be divided in two parts, 6801 and 7640, that added together give a palindrome (14441).

The spelling of 68017640 in words is "sixty-eight million, seventeen thousand, six hundred forty".