68247821 has 8 divisors (see below), whose sum is σ = 70608888. Its totient is φ = 65920000.

The previous prime is 68247799. The next prime is 68247841. The reversal of 68247821 is 12874286.

It can be written as a sum of positive squares in 4 ways, for example, as 8185321 + 60062500 = 2861^2 + 7750^2 .

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 68247821 - 2¹⁰ = 68246797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68247841) 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, 4100 + ... + 12381.

It is an arithmetic number, because the mean of its divisors is an integer number (8826111).

Almost surely, 2^68247821 is an apocalyptic number.

It is an amenable number.

68247821 is a deficient number, since it is larger than the sum of its proper divisors (2361067).

68247821 is a wasteful number, since it uses less digits than its factorization.

68247821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16623.

The product of its digits is 43008, while the sum is 38.

The square root of 68247821 is about 8261.2239407972. The cubic root of 68247821 is about 408.6607521171.

The spelling of 68247821 in words is "sixty-eight million, two hundred forty-seven thousand, eight hundred twenty-one".