68221306 has 16 divisors (see below), whose sum is σ = 110873664. Its totient is φ = 31356864.

The previous prime is 68221301. The next prime is 68221397. The reversal of 68221306 is 60312286.

It is not an unprimeable number, because it can be changed into a prime (68221301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21870 + ... + 24793.

It is an arithmetic number, because the mean of its divisors is an integer number (6929604).

Almost surely, 2^68221306 is an apocalyptic number.

68221306 is a deficient number, since it is larger than the sum of its proper divisors (42652358).

68221306 is a wasteful number, since it uses less digits than its factorization.

68221306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46725.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 68221306 is about 8259.6189984769. The cubic root of 68221306 is about 408.6078222543.

It can be divided in two parts, 6822 and 1306, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 68221306 in words is "sixty-eight million, two hundred twenty-one thousand, three hundred six".