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288490 = 25171697
BaseRepresentation
bin1000110011011101010
3112122201211
41012123222
533212430
610103334
72311036
oct1063352
9478654
10288490
11187824
1211ab4a
13a1407
14771c6
155a72a
hex466ea

288490 has 16 divisors (see below), whose sum is σ = 550152. Its totient is φ = 108544.

The previous prime is 288481. The next prime is 288493. The reversal of 288490 is 94882.

288490 = T56 + T57 + ... + T123.

It can be written as a sum of positive squares in 4 ways, for example, as 288369 + 121 = 537^2 + 11^2 .

It is not an unprimeable number, because it can be changed into a prime (288493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 679 + ... + 1018.

2288490 is an apocalyptic number.

288490 is the 340-th heptagonal number.

288490 is a deficient number, since it is larger than the sum of its proper divisors (261662).

288490 is a wasteful number, since it uses less digits than its factorization.

288490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 288490 is about 537.1126511264. The cubic root of 288490 is about 66.0759761731.

It can be divided in two parts, 2884 and 90, that multiplied together give a triangular number (259560 = T720).

The spelling of 288490 in words is "two hundred eighty-eight thousand, four hundred ninety".

Divisors: 1 2 5 10 17 34 85 170 1697 3394 8485 16970 28849 57698 144245 288490