128193680 has 40 divisors (see below), whose sum is σ = 307670784. Its totient is φ = 49622400.

The previous prime is 128193647. The next prime is 128193727. The reversal of 128193680 is 86391821.

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, 23366 + ... + 28325.

Almost surely, 2^128193680 is an apocalyptic number.

128193680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128193680 is an abundant number, since it is smaller than the sum of its proper divisors (179477104).

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

128193680 is a wasteful number, since it uses less digits than its factorization.

128193680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51735 (or 51729 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 128193680 is about 11322.2647911096. The cubic root of 128193680 is about 504.2224809308. Note that the first 3 decimals are identical.

The spelling of 128193680 in words is "one hundred twenty-eight million, one hundred ninety-three thousand, six hundred eighty".