2128618820 has 12 divisors (see below), whose sum is σ = 4470099564. Its totient is φ = 851447520.

The previous prime is 2128618801. The next prime is 2128618829. The reversal of 2128618820 is 288168212.

It can be written as a sum of positive squares in 2 ways, for example, as 1027971844 + 1100646976 = 32062^2 + 33176^2 .

It is not an unprimeable number, because it can be changed into a prime (2128618829) 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, 53215451 + ... + 53215490.

It is an arithmetic number, because the mean of its divisors is an integer number (372508297).

Almost surely, 2^2128618820 is an apocalyptic number.

2128618820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2128618820 is an abundant number, since it is smaller than the sum of its proper divisors (2341480744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2128618820 is a wasteful number, since it uses less digits than its factorization.

2128618820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106430950 (or 106430948 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 38.

The square root of 2128618820 is about 46136.9572035261. The cubic root of 2128618820 is about 1286.3701857743.

The spelling of 2128618820 in words is "two billion, one hundred twenty-eight million, six hundred eighteen thousand, eight hundred twenty".