68305513 has 4 divisors (see below), whose sum is σ = 71900560. Its totient is φ = 64710468.

The previous prime is 68305511. The next prime is 68305529. The reversal of 68305513 is 31550386.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68305513 - 2¹ = 68305511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68305511) 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, 1797495 + ... + 1797532.

It is an arithmetic number, because the mean of its divisors is an integer number (17975140).

Almost surely, 2^68305513 is an apocalyptic number.

It is an amenable number.

68305513 is a deficient number, since it is larger than the sum of its proper divisors (3595047).

68305513 is a wasteful number, since it uses less digits than its factorization.

68305513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3595046.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 68305513 is about 8264.7149376128. The cubic root of 68305513 is about 408.7758708885.

Adding to 68305513 its reverse (31550386), we get a palindrome (99855899).

The spelling of 68305513 in words is "sixty-eight million, three hundred five thousand, five hundred thirteen".