2155128260 has 12 divisors (see below), whose sum is σ = 4525769388. Its totient is φ = 862051296.

The previous prime is 2155128253. The next prime is 2155128263. The reversal of 2155128260 is 628215512.

It can be written as a sum of positive squares in 2 ways, for example, as 910590976 + 1244537284 = 30176^2 + 35278^2 .

It is not an unprimeable number, because it can be changed into a prime (2155128263) 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, 53878187 + ... + 53878226.

It is an arithmetic number, because the mean of its divisors is an integer number (377147449).

Almost surely, 2^2155128260 is an apocalyptic number.

2155128260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155128260 is an abundant number, since it is smaller than the sum of its proper divisors (2370641128).

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

2155128260 is a wasteful number, since it uses less digits than its factorization.

2155128260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107756422 (or 107756420 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 2155128260 is about 46423.3589909218. The cubic root of 2155128260 is about 1291.6882449026.

The spelling of 2155128260 in words is "two billion, one hundred fifty-five million, one hundred twenty-eight thousand, two hundred sixty".