68636689 has 4 divisors (see below), whose sum is σ = 74876400. Its totient is φ = 62396980.

The previous prime is 68636681. The next prime is 68636699. The reversal of 68636689 is 98663686.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68636689 - 2³ = 68636681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68636681) 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, 3119839 + ... + 3119860.

It is an arithmetic number, because the mean of its divisors is an integer number (18719100).

Almost surely, 2^68636689 is an apocalyptic number.

It is an amenable number.

68636689 is a deficient number, since it is larger than the sum of its proper divisors (6239711).

68636689 is a wasteful number, since it uses less digits than its factorization.

68636689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6239710.

The product of its digits is 2239488, while the sum is 52.

The square root of 68636689 is about 8284.7262477405. The cubic root of 68636689 is about 409.4354494500.

The spelling of 68636689 in words is "sixty-eight million, six hundred thirty-six thousand, six hundred eighty-nine".