68445221 has 8 divisors (see below), whose sum is σ = 73774680. Its totient is φ = 63124992.

The previous prime is 68445197. The next prime is 68445229. The reversal of 68445221 is 12254486.

It can be written as a sum of positive squares in 4 ways, for example, as 2608225 + 65836996 = 1615^2 + 8114^2 .

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 68445221 - 2¹⁰ = 68444197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68445229) 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, 26441 + ... + 28913.

It is an arithmetic number, because the mean of its divisors is an integer number (9221835).

Almost surely, 2^68445221 is an apocalyptic number.

It is an amenable number.

68445221 is a deficient number, since it is larger than the sum of its proper divisors (5329459).

68445221 is a wasteful number, since it uses less digits than its factorization.

68445221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4615.

The product of its digits is 15360, while the sum is 32.

The square root of 68445221 is about 8273.1626963332. The cubic root of 68445221 is about 409.0543763126.

The spelling of 68445221 in words is "sixty-eight million, four hundred forty-five thousand, two hundred twenty-one".