68320145 has 8 divisors (see below), whose sum is σ = 83984040. Its totient is φ = 53322880.

The previous prime is 68320141. The next prime is 68320177. The reversal of 68320145 is 54102386.

It can be written as a sum of positive squares in 4 ways, for example, as 1227664 + 67092481 = 1108^2 + 8191^2 .

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

It is not a de Polignac number, because 68320145 - 2² = 68320141 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68320141) 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, 166430 + ... + 166839.

It is an arithmetic number, because the mean of its divisors is an integer number (10498005).

Almost surely, 2^68320145 is an apocalyptic number.

It is an amenable number.

68320145 is a deficient number, since it is larger than the sum of its proper divisors (15663895).

68320145 is a wasteful number, since it uses less digits than its factorization.

68320145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333315.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 68320145 is about 8265.6000992063. The cubic root of 68320145 is about 408.8050573150.

The spelling of 68320145 in words is "sixty-eight million, three hundred twenty thousand, one hundred forty-five".