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BaseRepresentation
bin110110110100101
31102111121
412312211
51344234
6333541
7144556
oct66645
942447
1028069
111a0a8
12142b1
13ca12
14a32d
1584b4
hex6da5

28069 has 2 divisors, whose sum is σ = 28070. Its totient is φ = 28068.

The previous prime is 28057. The next prime is 28081. The reversal of 28069 is 96082.

It is a balanced prime because it is at equal distance from previous prime (28057) and next prime (28081).

It can be written as a sum of positive squares in only one way, i.e., 19044 + 9025 = 138^2 + 95^2 .

It is a cyclic number.

It is not a de Polignac number, because 28069 - 27 = 27941 is a prime.

It is a super-2 number, since 2×280692 = 1575737522, which contains 22 as substring.

28069 is a lucky number.

It is a plaindrome in base 7.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14034 + 14035.

It is an arithmetic number, because the mean of its divisors is an integer number (14035).

228069 is an apocalyptic number.

It is an amenable number.

28069 is a deficient number, since it is larger than the sum of its proper divisors (1).

28069 is an equidigital number, since it uses as much as digits as its factorization.

28069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 28069 is about 167.5380553785. The cubic root of 28069 is about 30.3908126669.

The spelling of 28069 in words is "twenty-eight thousand, sixty-nine".