2028945809 has 16 divisors (see below), whose sum is σ = 2241343104. Its totient is φ = 1821312000.

The previous prime is 2028945797. The next prime is 2028945829. The reversal of 2028945809 is 9085498202.

It is a cyclic number.

It is not a de Polignac number, because 2028945809 - 2⁸ = 2028945553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2028945829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 420209 + ... + 425009.

It is an arithmetic number, because the mean of its divisors is an integer number (140083944).

Almost surely, 2^2028945809 is an apocalyptic number.

It is an amenable number.

2028945809 is a deficient number, since it is larger than the sum of its proper divisors (212397295).

2028945809 is a wasteful number, since it uses less digits than its factorization.

2028945809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5288.

The product of its (nonzero) digits is 414720, while the sum is 47.

The square root of 2028945809 is about 45043.8209857912. The cubic root of 2028945809 is about 1265.9701991709.

The spelling of 2028945809 in words is "two billion, twenty-eight million, nine hundred forty-five thousand, eight hundred nine".