128947660 has 24 divisors (see below), whose sum is σ = 282564576. Its totient is φ = 49336320.

The previous prime is 128947639. The next prime is 128947667. The reversal of 128947660 is 66749821.

It is not an unprimeable number, because it can be changed into a prime (128947667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139701 + ... + 140620.

It is an arithmetic number, because the mean of its divisors is an integer number (11773524).

Almost surely, 2^128947660 is an apocalyptic number.

128947660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128947660 is an abundant number, since it is smaller than the sum of its proper divisors (153616916).

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

128947660 is a wasteful number, since it uses less digits than its factorization.

128947660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280353 (or 280351 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 128947660 is about 11355.5123178129. The cubic root of 128947660 is about 505.2090889884.

The spelling of 128947660 in words is "one hundred twenty-eight million, nine hundred forty-seven thousand, six hundred sixty".