68607721 has 8 divisors (see below), whose sum is σ = 84440384. Its totient is φ = 54282960.

The previous prime is 68607701. The next prime is 68607751. The reversal of 68607721 is 12770686.

It is a happy number.

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 68607721 - 2¹¹ = 68605673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68607701) 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, 376875 + ... + 377056.

It is an arithmetic number, because the mean of its divisors is an integer number (10555048).

Almost surely, 2^68607721 is an apocalyptic number.

It is an amenable number.

68607721 is a deficient number, since it is larger than the sum of its proper divisors (15832663).

68607721 is a wasteful number, since it uses less digits than its factorization.

68607721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753951.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 68607721 is about 8282.9777857966. The cubic root of 68607721 is about 409.3778408287.

The spelling of 68607721 in words is "sixty-eight million, six hundred seven thousand, seven hundred twenty-one".