261128 has 16 divisors (see below), whose sum is σ = 559680. Its totient is φ = 111888.

The previous prime is 261127. The next prime is 261167. The reversal of 261128 is 821162.

261128 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (261127) 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, 2276 + ... + 2387.

It is an arithmetic number, because the mean of its divisors is an integer number (34980).

2²⁶¹¹²⁸ is an apocalyptic number.

261128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

261128 is an abundant number, since it is smaller than the sum of its proper divisors (298552).

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

261128 is a wasteful number, since it uses less digits than its factorization.

261128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4676 (or 4672 counting only the distinct ones).

The product of its digits is 192, while the sum is 20.

The square root of 261128 is about 511.0068492692. The cubic root of 261128 is about 63.9172106596.

The spelling of 261128 in words is "two hundred sixty-one thousand, one hundred twenty-eight".