2128709140 has 24 divisors (see below), whose sum is σ = 4481797320. Its totient is φ = 849291648.

The previous prime is 2128709129. The next prime is 2128709153. The reversal of 2128709140 is 419078212.

It can be written as a sum of positive squares in 4 ways, for example, as 174715524 + 1953993616 = 13218^2 + 44204^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2128709096 and 2128709105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129027 + ... + 144586.

It is an arithmetic number, because the mean of its divisors is an integer number (186741555).

Almost surely, 2^2128709140 is an apocalyptic number.

2128709140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2128709140 is an abundant number, since it is smaller than the sum of its proper divisors (2353088180).

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

2128709140 is a wasteful number, since it uses less digits than its factorization.

2128709140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274011 (or 274009 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 2128709140 is about 46137.9360179885. The cubic root of 2128709140 is about 1286.3883796239.

The spelling of 2128709140 in words is "two billion, one hundred twenty-eight million, seven hundred nine thousand, one hundred forty".