128820880 has 40 divisors (see below), whose sum is σ = 299980800. Its totient is φ = 51447168.

The previous prime is 128820877. The next prime is 128820941. The reversal of 128820880 is 88028821.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100081 + ... + 101359.

It is an arithmetic number, because the mean of its divisors is an integer number (7499520).

Almost surely, 2^128820880 is an apocalyptic number.

128820880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128820880 is an abundant number, since it is smaller than the sum of its proper divisors (171159920).

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

128820880 is a wasteful number, since it uses less digits than its factorization.

128820880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2551 (or 2545 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 37.

The square root of 128820880 is about 11349.9286341369. The cubic root of 128820880 is about 505.0434625861.

The spelling of 128820880 in words is "one hundred twenty-eight million, eight hundred twenty thousand, eight hundred eighty".