68636811 has 4 divisors (see below), whose sum is σ = 91515752. Its totient is φ = 45757872.

The previous prime is 68636791. The next prime is 68636819. The reversal of 68636811 is 11863686.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 68636811 - 2¹⁸ = 68374667 is a prime.

It is a super-2 number, since 2×68636811² = 9422023648499442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68636811.

It is not an unprimeable number, because it can be changed into a prime (68636819) 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, 11439466 + ... + 11439471.

It is an arithmetic number, because the mean of its divisors is an integer number (22878938).

Almost surely, 2^68636811 is an apocalyptic number.

68636811 is a deficient number, since it is larger than the sum of its proper divisors (22878941).

68636811 is a wasteful number, since it uses less digits than its factorization.

68636811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22878940.

The product of its digits is 41472, while the sum is 39.

The square root of 68636811 is about 8284.7336106842. The cubic root of 68636811 is about 409.4356920369.

The spelling of 68636811 in words is "sixty-eight million, six hundred thirty-six thousand, eight hundred eleven".