128860880 has 20 divisors (see below), whose sum is σ = 299601732. Its totient is φ = 51544320.

The previous prime is 128860873. The next prime is 128860933. The reversal of 128860880 is 88068821.

It can be written as a sum of positive squares in 2 ways, for example, as 101445184 + 27415696 = 10072^2 + 5236^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 805301 + ... + 805460.

Almost surely, 2^128860880 is an apocalyptic number.

128860880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128860880 is an abundant number, since it is smaller than the sum of its proper divisors (170740852).

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

128860880 is a wasteful number, since it uses less digits than its factorization.

128860880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610774 (or 1610768 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 41.

The square root of 128860880 is about 11351.6906229865. The cubic root of 128860880 is about 505.0957306344.

The spelling of 128860880 in words is "one hundred twenty-eight million, eight hundred sixty thousand, eight hundred eighty".