128645584 has 40 divisors (see below), whose sum is σ = 256356360. Its totient is φ = 62515200.

The previous prime is 128645581. The next prime is 128645609. The reversal of 128645584 is 485546821.

It can be written as a sum of positive squares in 4 ways, for example, as 1587600 + 127057984 = 1260^2 + 11272^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 128645584.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128645581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86124 + ... + 87604.

It is an arithmetic number, because the mean of its divisors is an integer number (6408909).

Almost surely, 2^128645584 is an apocalyptic number.

It is an amenable number.

128645584 is a deficient number, since it is larger than the sum of its proper divisors (127710776).

128645584 is a wasteful number, since it uses less digits than its factorization.

128645584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1639 (or 1633 counting only the distinct ones).

The product of its digits is 307200, while the sum is 43.

The square root of 128645584 is about 11342.2036659549. The cubic root of 128645584 is about 504.8142753960.

The spelling of 128645584 in words is "one hundred twenty-eight million, six hundred forty-five thousand, five hundred eighty-four".