68836513 has 4 divisors (see below), whose sum is σ = 68853808. Its totient is φ = 68819220.

The previous prime is 68836511. The next prime is 68836561. The reversal of 68836513 is 31563886.

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 68836513 - 2¹ = 68836511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68836511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 670 + ... + 11752.

It is an arithmetic number, because the mean of its divisors is an integer number (17213452).

Almost surely, 2^68836513 is an apocalyptic number.

It is an amenable number.

68836513 is a deficient number, since it is larger than the sum of its proper divisors (17295).

68836513 is a wasteful number, since it uses less digits than its factorization.

68836513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17294.

The product of its digits is 103680, while the sum is 40.

The square root of 68836513 is about 8296.7772659027. Note that the first 3 decimals coincide. The cubic root of 68836513 is about 409.8323982820.

The spelling of 68836513 in words is "sixty-eight million, eight hundred thirty-six thousand, five hundred thirteen".