128502 has 36 divisors (see below), whose sum is σ = 311220. Its totient is φ = 38280.

The previous prime is 128489. The next prime is 128509. The reversal of 128502 is 205821.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128509) by changing a digit.

128502 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2149 + ... + 2207.

It is an arithmetic number, because the mean of its divisors is an integer number (8645).

2¹²⁸⁵⁰² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128502, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155610).

128502 is an abundant number, since it is smaller than the sum of its proper divisors (182718).

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

128502 is a wasteful number, since it uses less digits than its factorization.

128502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 128502 is about 358.4717562096. The cubic root of 128502 is about 50.4626394257.

It can be divided in two parts, 128 and 502, that added together give a triangular number (630 = T₃₅).

The spelling of 128502 in words is "one hundred twenty-eight thousand, five hundred two".