128980 has 12 divisors (see below), whose sum is σ = 270900. Its totient is φ = 51584.

The previous prime is 128971. The next prime is 128981. The reversal of 128980 is 89821.

It can be written as a sum of positive squares in 2 ways, for example, as 93636 + 35344 = 306^2 + 188^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128981) by changing a digit.

128980 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3205 + ... + 3244.

It is an arithmetic number, because the mean of its divisors is an integer number (22575).

2¹²⁸⁹⁸⁰ is an apocalyptic number.

128980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128980 is an abundant number, since it is smaller than the sum of its proper divisors (141920).

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

128980 is a wasteful number, since it uses less digits than its factorization.

128980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6458 (or 6456 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 128980 is about 359.1378565398. The cubic root of 128980 is about 50.5251320842.

It can be divided in two parts, 1289 and 80, that added together give a square (1369 = 37²).

The spelling of 128980 in words is "one hundred twenty-eight thousand, nine hundred eighty".