128181680 has 40 divisors (see below), whose sum is σ = 325117584. Its totient is φ = 46611200.

The previous prime is 128181661. The next prime is 128181701. The reversal of 128181680 is 86181821.

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

It is a self number, because there is not a number n which added to its sum of digits gives 128181680.

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, 71951 + ... + 73710.

Almost surely, 2^128181680 is an apocalyptic number.

128181680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128181680 is an abundant number, since it is smaller than the sum of its proper divisors (196935904).

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

128181680 is a wasteful number, since it uses less digits than its factorization.

128181680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145685 (or 145679 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 35.

The square root of 128181680 is about 11321.7348493948. The cubic root of 128181680 is about 504.2067472936.

The spelling of 128181680 in words is "one hundred twenty-eight million, one hundred eighty-one thousand, six hundred eighty".