2128125800 has 24 divisors (see below), whose sum is σ = 4947892950. Its totient is φ = 851250240.

The previous prime is 2128125751. The next prime is 2128125817. The reversal of 2128125800 is 85218212.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1197021604 + 931104196 = 34598^2 + 30514^2 .

It is a super-4 number, since 4×2128125800⁴ (a number of 38 digits) contains 4444 as substring.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 5320115 + ... + 5320514.

Almost surely, 2^2128125800 is an apocalyptic number.

2128125800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2128125800 is an abundant number, since it is smaller than the sum of its proper divisors (2819767150).

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

2128125800 is a wasteful number, since it uses less digits than its factorization.

2128125800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10640645 (or 10640636 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 2128125800 is about 46131.6138889591. The cubic root of 2128125800 is about 1286.2708639053.

The spelling of 2128125800 in words is "two billion, one hundred twenty-eight million, one hundred twenty-five thousand, eight hundred".