2000000645 has 8 divisors (see below), whose sum is σ = 2406048504. Its totient is φ = 1595968704.

The previous prime is 2000000641. The next prime is 2000000659. The reversal of 2000000645 is 5460000002.

It can be written as a sum of positive squares in 4 ways, for example, as 11464996 + 1988535649 = 3386^2 + 44593^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2000000645 - 2² = 2000000641 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 (2000000641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 501794 + ... + 505763.

It is an arithmetic number, because the mean of its divisors is an integer number (300756063).

Almost surely, 2^2000000645 is an apocalyptic number.

It is an amenable number.

2000000645 is a deficient number, since it is larger than the sum of its proper divisors (406047859).

2000000645 is a wasteful number, since it uses less digits than its factorization.

2000000645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007959.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 2000000645 is about 44721.3667613144. The cubic root of 2000000645 is about 1259.9211853364.

Adding to 2000000645 its reverse (5460000002), we get a palindrome (7460000647).

The spelling of 2000000645 in words is "two billion, six hundred forty-five", and thus it is an aban number.