68040688 has 20 divisors (see below), whose sum is σ = 134065080. Its totient is φ = 33443264.

The previous prime is 68040673. The next prime is 68040719. The reversal of 68040688 is 88604086.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 68040688.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 35095 + ... + 36982.

It is an arithmetic number, because the mean of its divisors is an integer number (6703254).

Almost surely, 2^68040688 is an apocalyptic number.

It is an amenable number.

68040688 is a deficient number, since it is larger than the sum of its proper divisors (66024392).

68040688 is a wasteful number, since it uses less digits than its factorization.

68040688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72144 (or 72138 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 68040688 is about 8248.6779546786. The cubic root of 68040688 is about 408.2469029712.

The spelling of 68040688 in words is "sixty-eight million, forty thousand, six hundred eighty-eight".