68013613 has 4 divisors (see below), whose sum is σ = 70358940. Its totient is φ = 65668288.

The previous prime is 68013611. The next prime is 68013637. The reversal of 68013613 is 31631086.

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 37785609 + 30228004 = 6147^2 + 5498^2 .

It is a cyclic number.

It is not a de Polignac number, because 68013613 - 2¹ = 68013611 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 (68013611) 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 3 ways as a sum of consecutive naturals, for example, 1172620 + ... + 1172677.

It is an arithmetic number, because the mean of its divisors is an integer number (17589735).

Almost surely, 2^68013613 is an apocalyptic number.

It is an amenable number.

68013613 is a deficient number, since it is larger than the sum of its proper divisors (2345327).

68013613 is a wasteful number, since it uses less digits than its factorization.

68013613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345326.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 68013613 is about 8247.0366192954. The cubic root of 68013613 is about 408.1927454190.

Adding to 68013613 its reverse (31631086), we get a palindrome (99644699).

The spelling of 68013613 in words is "sixty-eight million, thirteen thousand, six hundred thirteen".