128577680 has 80 divisors (see below), whose sum is σ = 372726144. Its totient is φ = 40074240.

The previous prime is 128577667. The next prime is 128577719. The reversal of 128577680 is 86775821.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (44).

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 15 ways as a sum of consecutive naturals, for example, 4277 + ... + 16596.

Almost surely, 2^128577680 is an apocalyptic number.

128577680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128577680 is an abundant number, since it is smaller than the sum of its proper divisors (244148464).

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

128577680 is a wasteful number, since it uses less digits than its factorization.

128577680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20904 (or 20898 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 44.

The square root of 128577680 is about 11339.2098490151. The cubic root of 128577680 is about 504.7254397477.

The spelling of 128577680 in words is "one hundred twenty-eight million, five hundred seventy-seven thousand, six hundred eighty".