68944013 has 4 divisors (see below), whose sum is σ = 69161820. Its totient is φ = 68726208.

The previous prime is 68944009. The next prime is 68944021. The reversal of 68944013 is 31044986.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14730244 + 54213769 = 3838^2 + 7363^2 .

It is a cyclic number.

It is not a de Polignac number, because 68944013 - 2² = 68944009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68944003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108428 + ... + 109061.

It is an arithmetic number, because the mean of its divisors is an integer number (17290455).

Almost surely, 2^68944013 is an apocalyptic number.

It is an amenable number.

68944013 is a deficient number, since it is larger than the sum of its proper divisors (217807).

68944013 is a wasteful number, since it uses less digits than its factorization.

68944013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217806.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 68944013 is about 8303.2531576485. The cubic root of 68944013 is about 410.0456284733.

Adding to 68944013 its reverse (31044986), we get a palindrome (99988999).

The spelling of 68944013 in words is "sixty-eight million, nine hundred forty-four thousand, thirteen".