68244521 has 8 divisors (see below), whose sum is σ = 68875464. Its totient is φ = 67616640.

The previous prime is 68244497. The next prime is 68244529. The reversal of 68244521 is 12544286.

It can be written as a sum of positive squares in 4 ways, for example, as 400 + 68244121 = 20^2 + 8261^2 .

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 68244521 - 2⁶ = 68244457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68244529) 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, 72365 + ... + 73301.

It is an arithmetic number, because the mean of its divisors is an integer number (8609433).

Almost surely, 2^68244521 is an apocalyptic number.

It is an amenable number.

68244521 is a deficient number, since it is larger than the sum of its proper divisors (630943).

68244521 is a wasteful number, since it uses less digits than its factorization.

68244521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1531.

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

The square root of 68244521 is about 8261.0242101086. The cubic root of 68244521 is about 408.6541653270.

The spelling of 68244521 in words is "sixty-eight million, two hundred forty-four thousand, five hundred twenty-one".