68581720 has 64 divisors (see below), whose sum is σ = 160056000. Its totient is φ = 26426880.

The previous prime is 68581691. The next prime is 68581729. The reversal of 68581720 is 2718586.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 68581720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68581729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220365 + ... + 220675.

It is an arithmetic number, because the mean of its divisors is an integer number (2500875).

Almost surely, 2^68581720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68581720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80028000).

68581720 is an abundant number, since it is smaller than the sum of its proper divisors (91474280).

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

68581720 is a wasteful number, since it uses less digits than its factorization.

68581720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508 (or 504 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 68581720 is about 8281.4080928306. The cubic root of 68581720 is about 409.3261188650.

The spelling of 68581720 in words is "sixty-eight million, five hundred eighty-one thousand, seven hundred twenty".