Search a number
-
+
129128 = 2316141
BaseRepresentation
bin11111100001101000
320120010112
4133201220
513113003
62433452
71045316
oct374150
9216115
10129128
118901a
1262888
1346a0c
14350b6
15283d8
hex1f868

129128 has 8 divisors (see below), whose sum is σ = 242130. Its totient is φ = 64560.

The previous prime is 129127. The next prime is 129169. The reversal of 129128 is 821921.

It can be written as a sum of positive squares in only one way, i.e., 114244 + 14884 = 338^2 + 122^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (129121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8063 + ... + 8078.

2129128 is an apocalyptic number.

It is an amenable number.

129128 is a deficient number, since it is larger than the sum of its proper divisors (113002).

129128 is a wasteful number, since it uses less digits than its factorization.

129128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16147 (or 16143 counting only the distinct ones).

The product of its digits is 288, while the sum is 23.

The square root of 129128 is about 359.3438464758. The cubic root of 129128 is about 50.5444499662.

The spelling of 129128 in words is "one hundred twenty-nine thousand, one hundred twenty-eight".

Divisors: 1 2 4 8 16141 32282 64564 129128