68013013 has 4 divisors (see below), whose sum is σ = 68075020. Its totient is φ = 67951008.

The previous prime is 68012983. The next prime is 68013037. The reversal of 68013013 is 31031086.

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 3017169 + 64995844 = 1737^2 + 8062^2 .

It is a cyclic number.

It is not a de Polignac number, because 68013013 - 2⁵ = 68012981 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 (68013083) 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, 29328 + ... + 31561.

It is an arithmetic number, because the mean of its divisors is an integer number (17018755).

Almost surely, 2^68013013 is an apocalyptic number.

It is an amenable number.

68013013 is a deficient number, since it is larger than the sum of its proper divisors (62007).

68013013 is a wasteful number, since it uses less digits than its factorization.

68013013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62006.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 68013013 is about 8247.0002425124. Note that the first 3 decimals coincide. The cubic root of 68013013 is about 408.1915450888.

Adding to 68013013 its reverse (31031086), we get a palindrome (99044099).

The spelling of 68013013 in words is "sixty-eight million, thirteen thousand, thirteen".