68720 has 20 divisors (see below), whose sum is σ = 159960. Its totient is φ = 27456.

The previous prime is 68713. The next prime is 68729. The reversal of 68720 is 2786.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68729) by changing a digit.

68720 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350 + ... + 509.

It is an arithmetic number, because the mean of its divisors is an integer number (7998).

2⁶⁸⁷²⁰ is an apocalyptic number.

It is an amenable number.

68720 is an abundant number, since it is smaller than the sum of its proper divisors (91240).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79980).

68720 is a wasteful number, since it uses less digits than its factorization.

68720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872 (or 866 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 68720 is about 262.1449980450. The cubic root of 68720 is about 40.9601039630.

It can be divided in two parts, 687 and 20, that added together give a palindrome (707).

The spelling of 68720 in words is "sixty-eight thousand, seven hundred twenty".