128984560 has 20 divisors (see below), whose sum is σ = 299889288. Its totient is φ = 51593792.

The previous prime is 128984543. The next prime is 128984579. The reversal of 128984560 is 65489821.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 806074 + ... + 806233.

Almost surely, 2^128984560 is an apocalyptic number.

128984560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128984560 is an abundant number, since it is smaller than the sum of its proper divisors (170904728).

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

128984560 is a wasteful number, since it uses less digits than its factorization.

128984560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612320 (or 1612314 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 128984560 is about 11357.1369631611. The cubic root of 128984560 is about 505.2572750442.

It can be divided in two parts, 1289 and 84560, that added together give a square (85849 = 293²).

The spelling of 128984560 in words is "one hundred twenty-eight million, nine hundred eighty-four thousand, five hundred sixty".