68820813 has 16 divisors (see below), whose sum is σ = 102099840. Its totient is φ = 45816192.

The previous prime is 68820803. The next prime is 68820827. The reversal of 68820813 is 31802886.

It is not a de Polignac number, because 68820813 - 2¹⁰ = 68819789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68820803) 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 15 ways as a sum of consecutive naturals, for example, 25245 + ... + 27837.

It is an arithmetic number, because the mean of its divisors is an integer number (6381240).

Almost surely, 2^68820813 is an apocalyptic number.

It is an amenable number.

68820813 is a deficient number, since it is larger than the sum of its proper divisors (33279027).

68820813 is a wasteful number, since it uses less digits than its factorization.

68820813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3585 (or 3579 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 68820813 is about 8295.8310614428. The cubic root of 68820813 is about 409.8012381819.

The spelling of 68820813 in words is "sixty-eight million, eight hundred twenty thousand, eight hundred thirteen".