128770 has 16 divisors (see below), whose sum is σ = 236160. Its totient is φ = 50544.

The previous prime is 128767. The next prime is 128813. The reversal of 128770 is 77821.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 709 + ... + 871.

It is an arithmetic number, because the mean of its divisors is an integer number (14760).

2¹²⁸⁷⁷⁰ is an apocalyptic number.

128770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128770 is a deficient number, since it is larger than the sum of its proper divisors (107390).

128770 is a wasteful number, since it uses less digits than its factorization.

128770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 128770 is about 358.8453705985. The cubic root of 128770 is about 50.4976961992.

It can be divided in two parts, 128 and 770, that added together give a palindrome (898).

The spelling of 128770 in words is "one hundred twenty-eight thousand, seven hundred seventy".