128877980 has 96 divisors (see below), whose sum is σ = 344010240. Its totient is φ = 39386880.

The previous prime is 128877979. The next prime is 128877989. The reversal of 128877980 is 89778821.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128877989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80831 + ... + 82409.

It is an arithmetic number, because the mean of its divisors is an integer number (3583440).

Almost surely, 2^128877980 is an apocalyptic number.

128877980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128877980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172005120).

128877980 is an abundant number, since it is smaller than the sum of its proper divisors (215132260).

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

128877980 is a wasteful number, since it uses less digits than its factorization.

128877980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1659 (or 1657 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 50.

The square root of 128877980 is about 11352.4437897750. The cubic root of 128877980 is about 505.1180719247.

The spelling of 128877980 in words is "one hundred twenty-eight million, eight hundred seventy-seven thousand, nine hundred eighty".