68128440 has 32 divisors (see below), whose sum is σ = 204385680. Its totient is φ = 18167552.

The previous prime is 68128409. The next prime is 68128441. The reversal of 68128440 is 4482186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68128441) by changing a digit.

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, 283749 + ... + 283988.

Almost surely, 2^68128440 is an apocalyptic number.

68128440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68128440 is an abundant number, since it is smaller than the sum of its proper divisors (136257240).

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

68128440 is a wasteful number, since it uses less digits than its factorization.

68128440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567751 (or 567747 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 68128440 is about 8253.9953961703. The cubic root of 68128440 is about 408.4223327685.

The spelling of 68128440 in words is "sixty-eight million, one hundred twenty-eight thousand, four hundred forty".