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280528 = 2489197
BaseRepresentation
bin1000100011111010000
3112020210221
41010133100
532434103
610002424
72245603
oct1043720
9466727
10280528
11181846
12116414
139a8c1
147433a
15581bd
hex447d0

280528 has 20 divisors (see below), whose sum is σ = 552420. Its totient is φ = 137984.

The previous prime is 280513. The next prime is 280537. The reversal of 280528 is 825082.

It can be written as a sum of positive squares in 2 ways, for example, as 183184 + 97344 = 428^2 + 312^2 .

It is a congruent number.

It is an unprimeable number.

280528 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1326 + ... + 1522.

It is an arithmetic number, because the mean of its divisors is an integer number (27621).

2280528 is an apocalyptic number.

It is an amenable number.

280528 is a deficient number, since it is larger than the sum of its proper divisors (271892).

280528 is a wasteful number, since it uses less digits than its factorization.

280528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 280528 is about 529.6489403369. The cubic root of 280528 is about 65.4624223592.

It can be divided in two parts, 280 and 528, that added together give a palindrome (808).

The spelling of 280528 in words is "two hundred eighty thousand, five hundred twenty-eight".

Divisors: 1 2 4 8 16 89 178 197 356 394 712 788 1424 1576 3152 17533 35066 70132 140264 280528