68355840 has 144 divisors (see below), whose sum is σ = 249596928. Its totient is φ = 15618048.

The previous prime is 68355823. The next prime is 68355869. The reversal of 68355840 is 4855386.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25609 + ... + 28151.

It is an arithmetic number, because the mean of its divisors is an integer number (1733312).

Almost surely, 2^68355840 is an apocalyptic number.

68355840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68355840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124798464).

68355840 is an abundant number, since it is smaller than the sum of its proper divisors (181241088).

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

68355840 is a wasteful number, since it uses less digits than its factorization.

68355840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2574 (or 2560 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

The square root of 68355840 is about 8267.7590676071. The cubic root of 68355840 is about 408.8762405945.

The spelling of 68355840 in words is "sixty-eight million, three hundred fifty-five thousand, eight hundred forty".