128381564 has 12 divisors (see below), whose sum is σ = 230740104. Its totient is φ = 62455824.

The previous prime is 128381563. The next prime is 128381587. The reversal of 128381564 is 465183821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128381563) 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 3 ways as a sum of consecutive naturals, for example, 433574 + ... + 433869.

It is an arithmetic number, because the mean of its divisors is an integer number (19228342).

Almost surely, 2^128381564 is an apocalyptic number.

It is an amenable number.

128381564 is a deficient number, since it is larger than the sum of its proper divisors (102358540).

128381564 is a wasteful number, since it uses less digits than its factorization.

128381564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867484 (or 867482 counting only the distinct ones).

The product of its digits is 46080, while the sum is 38.

The square root of 128381564 is about 11330.5588564731. The cubic root of 128381564 is about 504.4686945561.

The spelling of 128381564 in words is "one hundred twenty-eight million, three hundred eighty-one thousand, five hundred sixty-four".