Search a number
BaseRepresentation
bin11111010100011111
320111222101
4133110133
513101122
62425531
71043005
oct372437
9214871
10128287
1188425
12622a7
1346513
1434a75
1528027
hex1f51f

128287 has 2 divisors, whose sum is σ = 128288. Its totient is φ = 128286.

The previous prime is 128273. The next prime is 128291. The reversal of 128287 is 782821.

It can be divided in two parts, 1282 and 87, that added together give a square (1369 = 372).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128287 - 27 = 128159 is a prime.

It is a super-3 number, since 3×1282873 = 6333870832007709, which contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128237) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64143 + 64144.

It is an arithmetic number, because the mean of its divisors is an integer number (64144).

2128287 is an apocalyptic number.

128287 is a deficient number, since it is larger than the sum of its proper divisors (1).

128287 is an equidigital number, since it uses as much as digits as its factorization.

128287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1792, while the sum is 28.

The square root of 128287 is about 358.1717465128. The cubic root of 128287 is about 50.4344802688.

The spelling of 128287 in words is "one hundred twenty-eight thousand, two hundred eighty-seven".