2128745980 has 48 divisors (see below), whose sum is σ = 4521059424. Its totient is φ = 841881600.

The previous prime is 2128745951. The next prime is 2128745981. The reversal of 2128745980 is 895478212.

It is a self number, because there is not a number n which added to its sum of digits gives 2128745980.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2128745981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1181080 + ... + 1182880.

It is an arithmetic number, because the mean of its divisors is an integer number (94188738).

Almost surely, 2^2128745980 is an apocalyptic number.

2128745980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2128745980 is an abundant number, since it is smaller than the sum of its proper divisors (2392313444).

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

2128745980 is a wasteful number, since it uses less digits than its factorization.

2128745980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2446 (or 2444 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 46.

The square root of 2128745980 is about 46138.3352538862. The cubic root of 2128745980 is about 1286.3958004396.

The spelling of 2128745980 in words is "two billion, one hundred twenty-eight million, seven hundred forty-five thousand, nine hundred eighty".