128156 has 24 divisors (see below), whose sum is σ = 268800. Its totient is φ = 52272.

The previous prime is 128153. The next prime is 128159. The reversal of 128156 is 651821.

It is an interprime number because it is at equal distance from previous prime (128153) and next prime (128159).

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 128156.

It is not an unprimeable number, because it can be changed into a prime (128153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 545 + ... + 743.

It is an arithmetic number, because the mean of its divisors is an integer number (11200).

2¹²⁸¹⁵⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134400).

128156 is an abundant number, since it is smaller than the sum of its proper divisors (140644).

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

128156 is a wasteful number, since it uses less digits than its factorization.

128156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233 (or 231 counting only the distinct ones).

The product of its digits is 480, while the sum is 23.

The square root of 128156 is about 357.9888266413. The cubic root of 128156 is about 50.4173074010.

Adding to 128156 its reverse (651821), we get a palindrome (779977).

It can be divided in two parts, 12815 and 6, that added together give a palindrome (12821).

The spelling of 128156 in words is "one hundred twenty-eight thousand, one hundred fifty-six".