68343840 has 144 divisors (see below), whose sum is σ = 240903936. Its totient is φ = 17625600.

The previous prime is 68343839. The next prime is 68343853. The reversal of 68343840 is 4834386.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 68343795 and 68343804.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43875 + ... + 45405.

It is an arithmetic number, because the mean of its divisors is an integer number (1672944).

Almost surely, 2^68343840 is an apocalyptic number.

68343840 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 68343840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120451968).

68343840 is an abundant number, since it is smaller than the sum of its proper divisors (172560096).

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

68343840 is a wasteful number, since it uses less digits than its factorization.

68343840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583 (or 1572 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 68343840 is about 8267.0333252020. The cubic root of 68343840 is about 408.8523128559.

The spelling of 68343840 in words is "sixty-eight million, three hundred forty-three thousand, eight hundred forty".