128785386 has 16 divisors (see below), whose sum is σ = 258173568. Its totient is φ = 42828000.

The previous prime is 128785381. The next prime is 128785417. The reversal of 128785386 is 683587821.

It is not an unprimeable number, because it can be changed into a prime (128785381) 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, 22315 + ... + 27486.

It is an arithmetic number, because the mean of its divisors is an integer number (16135848).

Almost surely, 2^128785386 is an apocalyptic number.

128785386 is an abundant number, since it is smaller than the sum of its proper divisors (129388182).

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

128785386 is a wasteful number, since it uses less digits than its factorization.

128785386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50237.

The product of its digits is 645120, while the sum is 48.

The square root of 128785386 is about 11348.3649042494. The cubic root of 128785386 is about 504.9970734726.

The spelling of 128785386 in words is "one hundred twenty-eight million, seven hundred eighty-five thousand, three hundred eighty-six".