2028640423 has 4 divisors (see below), whose sum is σ = 2030308560. Its totient is φ = 2026972288.

The previous prime is 2028640421. The next prime is 2028640459. The reversal of 2028640423 is 3240468202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2028640423 - 2¹ = 2028640421 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 (2028640421) 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 3 ways as a sum of consecutive naturals, for example, 832243 + ... + 834676.

It is an arithmetic number, because the mean of its divisors is an integer number (507577140).

Almost surely, 2^2028640423 is an apocalyptic number.

2028640423 is a deficient number, since it is larger than the sum of its proper divisors (1668137).

2028640423 is a wasteful number, since it uses less digits than its factorization.

2028640423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668136.

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 2028640423 is about 45040.4309815082. The cubic root of 2028640423 is about 1265.9066803110.

The spelling of 2028640423 in words is "two billion, twenty-eight million, six hundred forty thousand, four hundred twenty-three".