68636889 has 20 divisors (see below), whose sum is σ = 103694580. Its totient is φ = 45239040.

The previous prime is 68636879. The next prime is 68636917. The reversal of 68636889 is 98863686.

It can be written as a sum of positive squares in 2 ways, for example, as 21233664 + 47403225 = 4608^2 + 6885^2 .

It is not a de Polignac number, because 68636889 - 2⁹ = 68636377 is a prime.

It is a super-2 number, since 2×68636889² = 9422045063196642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68636819) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2449 + ... + 11969.

It is an arithmetic number, because the mean of its divisors is an integer number (5184729).

Almost surely, 2^68636889 is an apocalyptic number.

It is an amenable number.

68636889 is a deficient number, since it is larger than the sum of its proper divisors (35057691).

68636889 is an equidigital number, since it uses as much as digits as its factorization.

68636889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9622 (or 9613 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The square root of 68636889 is about 8284.7383181365. The cubic root of 68636889 is about 409.4358471334.

The spelling of 68636889 in words is "sixty-eight million, six hundred thirty-six thousand, eight hundred eighty-nine".