2068400689 has 4 divisors (see below), whose sum is σ = 2068491760. Its totient is φ = 2068309620.

The previous prime is 2068400683. The next prime is 2068400713. The reversal of 2068400689 is 9860048602.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2068400689 - 2⁷ = 2068400561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2068400683) 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, 19402 + ... + 67180.

It is an arithmetic number, because the mean of its divisors is an integer number (517122940).

Almost surely, 2^2068400689 is an apocalyptic number.

It is an amenable number.

2068400689 is a deficient number, since it is larger than the sum of its proper divisors (91071).

2068400689 is an equidigital number, since it uses as much as digits as its factorization.

2068400689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91070.

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 2068400689 is about 45479.6733607444. The cubic root of 2068400689 is about 1274.1235938460.

The spelling of 2068400689 in words is "two billion, sixty-eight million, four hundred thousand, six hundred eighty-nine".