2000628809 has 4 divisors (see below), whose sum is σ = 2000730900. Its totient is φ = 2000526720.

The previous prime is 2000628797. The next prime is 2000628823. The reversal of 2000628809 is 9088260002.

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 1290246400 + 710382409 = 35920^2 + 26653^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2000628809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2000628859) 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, 11372 + ... + 64269.

It is an arithmetic number, because the mean of its divisors is an integer number (500182725).

Almost surely, 2^2000628809 is an apocalyptic number.

It is an amenable number.

2000628809 is a deficient number, since it is larger than the sum of its proper divisors (102091).

2000628809 is an equidigital number, since it uses as much as digits as its factorization.

2000628809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102090.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 2000628809 is about 44728.3892958376. The cubic root of 2000628809 is about 1260.0530776750.

The spelling of 2000628809 in words is "two billion, six hundred twenty-eight thousand, eight hundred nine".