68569909 has 4 divisors (see below), whose sum is σ = 68586604. Its totient is φ = 68553216.

The previous prime is 68569889. The next prime is 68569927. The reversal of 68569909 is 90996586.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7963684 + 60606225 = 2822^2 + 7785^2 .

It is a cyclic number.

It is not a de Polignac number, because 68569909 - 2¹⁷ = 68438837 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 (68569409) 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, 2599 + ... + 11995.

It is an arithmetic number, because the mean of its divisors is an integer number (17146651).

Almost surely, 2^68569909 is an apocalyptic number.

It is an amenable number.

68569909 is a deficient number, since it is larger than the sum of its proper divisors (16695).

68569909 is an equidigital number, since it uses as much as digits as its factorization.

68569909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16694.

The product of its (nonzero) digits is 1049760, while the sum is 52.

The square root of 68569909 is about 8280.6949587580. The cubic root of 68569909 is about 409.3026197540.

The spelling of 68569909 in words is "sixty-eight million, five hundred sixty-nine thousand, nine hundred nine".