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28031 is a prime number
BaseRepresentation
bin110110101111111
31102110012
412311333
51344111
6333435
7144503
oct66577
942405
1028031
111a073
121427b
13c9b3
14a303
15848b
hex6d7f

28031 has 2 divisors, whose sum is σ = 28032. Its totient is φ = 28030.

The previous prime is 28027. The next prime is 28051. The reversal of 28031 is 13082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28031 - 22 = 28027 is a prime.

It is a super-2 number, since 2×280312 = 1571473922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 27997 and 28015.

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 28031.

It is not a weakly prime, because it can be changed into another prime (28001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14015 + 14016.

It is an arithmetic number, because the mean of its divisors is an integer number (14016).

228031 is an apocalyptic number.

28031 is a deficient number, since it is larger than the sum of its proper divisors (1).

28031 is an equidigital number, since it uses as much as digits as its factorization.

28031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 28031 is about 167.4246098995. The cubic root of 28031 is about 30.3770920449.

The spelling of 28031 in words is "twenty-eight thousand, thirty-one".