68807813 has 4 divisors (see below), whose sum is σ = 68898060. Its totient is φ = 68717568.

The previous prime is 68807777. The next prime is 68807821. The reversal of 68807813 is 31870886.

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 8076964 + 60730849 = 2842^2 + 7793^2 .

It is a cyclic number.

It is not a de Polignac number, because 68807813 - 2¹² = 68803717 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 (68806813) 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, 43970 + ... + 45507.

It is an arithmetic number, because the mean of its divisors is an integer number (17224515).

Almost surely, 2^68807813 is an apocalyptic number.

It is an amenable number.

68807813 is a deficient number, since it is larger than the sum of its proper divisors (90247).

68807813 is an equidigital number, since it uses as much as digits as its factorization.

68807813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90246.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 68807813 is about 8295.0474983571. The cubic root of 68807813 is about 409.7754332384.

The spelling of 68807813 in words is "sixty-eight million, eight hundred seven thousand, eight hundred thirteen".