68623813 has 4 divisors (see below), whose sum is σ = 68777100. Its totient is φ = 68470528.

The previous prime is 68623799. The next prime is 68623871. The reversal of 68623813 is 31832686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31832686 = 2 ⋅15916343.

It can be written as a sum of positive squares in 2 ways, for example, as 23020804 + 45603009 = 4798^2 + 6753^2 .

It is a cyclic number.

It is not a de Polignac number, because 68623813 - 2⁹ = 68623301 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 (68623013) 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, 75970 + ... + 76867.

It is an arithmetic number, because the mean of its divisors is an integer number (17194275).

Almost surely, 2^68623813 is an apocalyptic number.

It is an amenable number.

68623813 is a deficient number, since it is larger than the sum of its proper divisors (153287).

68623813 is a wasteful number, since it uses less digits than its factorization.

68623813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153286.

The product of its digits is 41472, while the sum is 37.

The square root of 68623813 is about 8283.9491186269. The cubic root of 68623813 is about 409.4098449683.

The spelling of 68623813 in words is "sixty-eight million, six hundred twenty-three thousand, eight hundred thirteen".