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28925 = 521389
BaseRepresentation
bin111000011111101
31110200022
413003331
51411200
6341525
7150221
oct70375
943608
1028925
111a806
12148a5
1310220
14a781
158885
hex70fd

28925 has 12 divisors (see below), whose sum is σ = 39060. Its totient is φ = 21120.

The previous prime is 28921. The next prime is 28927. The reversal of 28925 is 52982.

28925 = 202 + 212 + ... + 452.

It can be written as a sum of positive squares in 6 ways, for example, as 6724 + 22201 = 82^2 + 149^2 .

It is not a de Polignac number, because 28925 - 22 = 28921 is a prime.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 28894 and 28903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28921) 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, 281 + ... + 369.

It is an arithmetic number, because the mean of its divisors is an integer number (3255).

228925 is an apocalyptic number.

28925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28925 is a deficient number, since it is larger than the sum of its proper divisors (10135).

28925 is a wasteful number, since it uses less digits than its factorization.

28925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112 (or 107 counting only the distinct ones).

The product of its digits is 1440, while the sum is 26.

The square root of 28925 is about 170.0735135169. The cubic root of 28925 is about 30.6966599018.

It can be divided in two parts, 289 and 25, that multiplied together give a square (7225 = 852).

The spelling of 28925 in words is "twenty-eight thousand, nine hundred twenty-five".

Divisors: 1 5 13 25 65 89 325 445 1157 2225 5785 28925