128887980 has 96 divisors (see below), whose sum is σ = 391608000. Its totient is φ = 31484928.

The previous prime is 128887973. The next prime is 128888003. The reversal of 128887980 is 89788821.

128887980 = T₁₇₅ + T₁₇₆ + ... + T₉₁₉.

It is a happy number.

It is a super-2 number, since 2×128887980² = 33224222776960800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115666 + ... + 116774.

It is an arithmetic number, because the mean of its divisors is an integer number (4079250).

Almost surely, 2^128887980 is an apocalyptic number.

128887980 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 128887980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195804000).

128887980 is an abundant number, since it is smaller than the sum of its proper divisors (262720020).

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

128887980 is a wasteful number, since it uses less digits than its factorization.

128887980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283 (or 1281 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 51.

The square root of 128887980 is about 11352.8842150354. The cubic root of 128887980 is about 505.1311360909.

The spelling of 128887980 in words is "one hundred twenty-eight million, eight hundred eighty-seven thousand, nine hundred eighty".