68006720 has 42 divisors (see below), whose sum is σ = 162293046. Its totient is φ = 27143680.

The previous prime is 68006713. The next prime is 68006737. The reversal of 68006720 is 2760086.

It can be written as a sum of positive squares in 3 ways, for example, as 1290496 + 66716224 = 1136^2 + 8168^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 147290 + ... + 147750.

Almost surely, 2^68006720 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 68006720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81146523).

68006720 is an abundant number, since it is smaller than the sum of its proper divisors (94286326).

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

68006720 is an frugal number, since it uses more digits than its factorization.

68006720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939 (or 468 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 68006720 is about 8246.6187010192. The cubic root of 68006720 is about 408.1789552010.

The spelling of 68006720 in words is "sixty-eight million, six thousand, seven hundred twenty".