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28025 = 521959
BaseRepresentation
bin110110101111001
31102102222
412311321
51344100
6333425
7144464
oct66571
942388
1028025
111a068
1214275
13c9aa
14a2db
158485
hex6d79

28025 has 12 divisors (see below), whose sum is σ = 37200. Its totient is φ = 20880.

The previous prime is 28019. The next prime is 28027. The reversal of 28025 is 52082.

It is a happy number.

28025 is nontrivially palindromic in base 4.

It is not a de Polignac number, because 28025 - 26 = 27961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27994 and 28012.

It is not an unprimeable number, because it can be changed into a prime (28027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 446 + ... + 504.

It is an arithmetic number, because the mean of its divisors is an integer number (3100).

228025 is an apocalyptic number.

28025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28025 is a deficient number, since it is larger than the sum of its proper divisors (9175).

28025 is a wasteful number, since it uses less digits than its factorization.

28025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 28025 is about 167.4066904278. The cubic root of 28025 is about 30.3749244975.

The spelling of 28025 in words is "twenty-eight thousand, twenty-five".

Divisors: 1 5 19 25 59 95 295 475 1121 1475 5605 28025