128827980 has 144 divisors (see below), whose sum is σ = 415833600. Its totient is φ = 32192640.

The previous prime is 128827943. The next prime is 128828003. The reversal of 128827980 is 89728821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 475245 + ... + 475515.

Almost surely, 2^128827980 is an apocalyptic number.

128827980 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 128827980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207916800).

128827980 is an abundant number, since it is smaller than the sum of its proper divisors (287005620).

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

128827980 is a wasteful number, since it uses less digits than its factorization.

128827980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444 (or 439 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 128827980 is about 11350.2414071243. The cubic root of 128827980 is about 505.0527409544.

The spelling of 128827980 in words is "one hundred twenty-eight million, eight hundred twenty-seven thousand, nine hundred eighty".