68568721 has 8 divisors (see below), whose sum is σ = 74298560. Its totient is φ = 62903952.

The previous prime is 68568719. The next prime is 68568743. The reversal of 68568721 is 12786586.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68568721 - 2¹ = 68568719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68568751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14061 + ... + 18298.

It is an arithmetic number, because the mean of its divisors is an integer number (9287320).

Almost surely, 2^68568721 is an apocalyptic number.

It is an amenable number.

68568721 is a deficient number, since it is larger than the sum of its proper divisors (5729839).

68568721 is a wasteful number, since it uses less digits than its factorization.

68568721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32535.

The product of its digits is 161280, while the sum is 43.

The square root of 68568721 is about 8280.6232253376. The cubic root of 68568721 is about 409.3002559653.

The spelling of 68568721 in words is "sixty-eight million, five hundred sixty-eight thousand, seven hundred twenty-one".