128443785 has 16 divisors (see below), whose sum is σ = 206110656. Its totient is φ = 68303168.

The previous prime is 128443769. The next prime is 128443787. The reversal of 128443785 is 587344821.

It is a cyclic number.

It is not a de Polignac number, because 128443785 - 2⁴ = 128443769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128443787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7134 + ... + 17543.

It is an arithmetic number, because the mean of its divisors is an integer number (12881916).

Almost surely, 2^128443785 is an apocalyptic number.

128443785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128443785 is a deficient number, since it is larger than the sum of its proper divisors (77666871).

128443785 is a wasteful number, since it uses less digits than its factorization.

128443785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25032.

The product of its digits is 215040, while the sum is 42.

The square root of 128443785 is about 11333.3042401587. The cubic root of 128443785 is about 504.5501794571.

The spelling of 128443785 in words is "one hundred twenty-eight million, four hundred forty-three thousand, seven hundred eighty-five".