68721133 has 8 divisors (see below), whose sum is σ = 74122776. Its totient is φ = 63336000.

The previous prime is 68721131. The next prime is 68721137. The reversal of 68721133 is 33112786.

It can be written as a sum of positive squares in 4 ways, for example, as 2184484 + 66536649 = 1478^2 + 8157^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 68721133 - 2¹ = 68721131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68721095 and 68721104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68721131) 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, 5343 + ... + 12883.

It is an arithmetic number, because the mean of its divisors is an integer number (9265347).

Almost surely, 2^68721133 is an apocalyptic number.

It is an amenable number.

68721133 is a deficient number, since it is larger than the sum of its proper divisors (5401643).

68721133 is a wasteful number, since it uses less digits than its factorization.

68721133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8255.

The product of its digits is 6048, while the sum is 31.

The square root of 68721133 is about 8289.8210475257. The cubic root of 68721133 is about 409.6032906745.

The spelling of 68721133 in words is "sixty-eight million, seven hundred twenty-one thousand, one hundred thirty-three".