68913721 has 8 divisors (see below), whose sum is σ = 71835200. Its totient is φ = 66048048.

The previous prime is 68913673. The next prime is 68913731. The reversal of 68913721 is 12731986.

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 68913721 - 2²¹ = 66816569 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68913731) 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, 11421 + ... + 16378.

It is an arithmetic number, because the mean of its divisors is an integer number (8979400).

Almost surely, 2^68913721 is an apocalyptic number.

It is an amenable number.

68913721 is a deficient number, since it is larger than the sum of its proper divisors (2921479).

68913721 is a wasteful number, since it uses less digits than its factorization.

68913721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27903.

The product of its digits is 18144, while the sum is 37.

The square root of 68913721 is about 8301.4288529144. The cubic root of 68913721 is about 409.9855656231.

The spelling of 68913721 in words is "sixty-eight million, nine hundred thirteen thousand, seven hundred twenty-one".