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28628 = 2217421
BaseRepresentation
bin110111111010100
31110021022
412333110
51404003
6340312
7146315
oct67724
943238
1028628
111a566
1214698
1310052
14a60c
158738
hex6fd4

28628 has 12 divisors (see below), whose sum is σ = 53172. Its totient is φ = 13440.

The previous prime is 28627. The next prime is 28631. The reversal of 28628 is 82682.

It can be divided in two parts, 286 and 28, that multiplied together give a palindrome (8008).

It can be written as a sum of positive squares in 2 ways, for example, as 8464 + 20164 = 92^2 + 142^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28597 and 28606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143 + ... + 278.

It is an arithmetic number, because the mean of its divisors is an integer number (4431).

228628 is an apocalyptic number.

It is an amenable number.

28628 is a deficient number, since it is larger than the sum of its proper divisors (24544).

28628 is a wasteful number, since it uses less digits than its factorization.

28628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442 (or 440 counting only the distinct ones).

The product of its digits is 1536, while the sum is 26.

The square root of 28628 is about 169.1981087365. The cubic root of 28628 is about 30.5912344779.

The spelling of 28628 in words is "twenty-eight thousand, six hundred twenty-eight".

Divisors: 1 2 4 17 34 68 421 842 1684 7157 14314 28628