128158785 has 12 divisors (see below), whose sum is σ = 222141972. Its totient is φ = 68351328.

The previous prime is 128158747. The next prime is 128158813. The reversal of 128158785 is 587851821.

It can be written as a sum of positive squares in 2 ways, for example, as 42614784 + 85544001 = 6528^2 + 9249^2 .

It is not a de Polignac number, because 128158785 - 2⁶ = 128158721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 2847973 = 128158785 / (1 + 2 + 8 + 1 + 5 + 8 + 7 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 128158785.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1423942 + ... + 1424031.

It is an arithmetic number, because the mean of its divisors is an integer number (18511831).

Almost surely, 2^128158785 is an apocalyptic number.

128158785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128158785 is a deficient number, since it is larger than the sum of its proper divisors (93983187).

128158785 is a wasteful number, since it uses less digits than its factorization.

128158785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2847984 (or 2847981 counting only the distinct ones).

The product of its digits is 179200, while the sum is 45.

The square root of 128158785 is about 11320.7236959481. The cubic root of 128158785 is about 504.1767261006.

The spelling of 128158785 in words is "one hundred twenty-eight million, one hundred fifty-eight thousand, seven hundred eighty-five".