128669085 has 24 divisors (see below), whose sum is σ = 230719320. Its totient is φ = 66256512.

The previous prime is 128669081. The next prime is 128669087. The reversal of 128669085 is 580966821.

It can be written as a sum of positive squares in 4 ways, for example, as 56385081 + 72284004 = 7509^2 + 8502^2 .

It is not a de Polignac number, because 128669085 - 2² = 128669081 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 128669085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128669081) 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 23 ways as a sum of consecutive naturals, for example, 47994 + ... + 50603.

It is an arithmetic number, because the mean of its divisors is an integer number (9613305).

Almost surely, 2^128669085 is an apocalyptic number.

128669085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128669085 is a deficient number, since it is larger than the sum of its proper divisors (102050235).

128669085 is a wasteful number, since it uses less digits than its factorization.

128669085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98637 (or 98634 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 128669085 is about 11343.2396166175. The cubic root of 128669085 is about 504.8450133806.

The spelling of 128669085 in words is "one hundred twenty-eight million, six hundred sixty-nine thousand, eighty-five".