68806540 has 24 divisors (see below), whose sum is σ = 157630032. Its totient is φ = 25020480.

The previous prime is 68806537. The next prime is 68806559. The reversal of 68806540 is 4560886.

It is a self number, because there is not a number n which added to its sum of digits gives 68806540.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156159 + ... + 156598.

It is an arithmetic number, because the mean of its divisors is an integer number (6567918).

Almost surely, 2^68806540 is an apocalyptic number.

It is an amenable number.

68806540 is an abundant number, since it is smaller than the sum of its proper divisors (88823492).

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

68806540 is a wasteful number, since it uses less digits than its factorization.

68806540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312777 (or 312775 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 68806540 is about 8294.9707654699. The cubic root of 68806540 is about 409.7729061642.

It can be divided in two parts, 68 and 806540, that added together give a palindrome (806608).

The spelling of 68806540 in words is "sixty-eight million, eight hundred six thousand, five hundred forty".