Search a number
-
+
642832 = 2440177
BaseRepresentation
bin10011100111100010000
31012122210121
42130330100
5131032312
621440024
75315101
oct2347420
91178717
10642832
113a9a73
12270014
13196798
1412a3a8
15ca707
hex9cf10

642832 has 10 divisors (see below), whose sum is σ = 1245518. Its totient is φ = 321408.

The previous prime is 642809. The next prime is 642833. The reversal of 642832 is 238246.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 633616 + 9216 = 796^2 + 96^2 .

It is a junction number, because it is equal to n+sod(n) for n = 642797 and 642806.

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 642832.

It is not an unprimeable number, because it can be changed into a prime (642833) by changing a digit.

642832 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20073 + ... + 20104.

2642832 is an apocalyptic number.

It is an amenable number.

642832 is a deficient number, since it is larger than the sum of its proper divisors (602686).

642832 is a wasteful number, since it uses less digits than its factorization.

642832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40185 (or 40179 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

The square root of 642832 is about 801.7680462578. The cubic root of 642832 is about 86.3043122179.

The spelling of 642832 in words is "six hundred forty-two thousand, eight hundred thirty-two".

Divisors: 1 2 4 8 16 40177 80354 160708 321416 642832