68142013 has 4 divisors (see below), whose sum is σ = 68189148. Its totient is φ = 68094880.

The previous prime is 68141989. The next prime is 68142043. The reversal of 68142013 is 31024186.

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 46963609 + 21178404 = 6853^2 + 4602^2 .

It is a cyclic number.

It is not a de Polignac number, because 68142013 - 2¹⁷ = 68010941 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 (68142043) 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, 21328 + ... + 24313.

It is an arithmetic number, because the mean of its divisors is an integer number (17047287).

Almost surely, 2^68142013 is an apocalyptic number.

It is an amenable number.

68142013 is a deficient number, since it is larger than the sum of its proper divisors (47135).

68142013 is a wasteful number, since it uses less digits than its factorization.

68142013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47134.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 68142013 is about 8254.8175630961. The cubic root of 68142013 is about 408.4494538369.

Adding to 68142013 its reverse (31024186), we get a palindrome (99166199).

The spelling of 68142013 in words is "sixty-eight million, one hundred forty-two thousand, thirteen".