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289128 = 23371721
BaseRepresentation
bin1000110100101101000
3112200121110
41012211220
533223003
610110320
72312640
oct1064550
9480543
10289128
11188254
1211b3a0
13a17a8
1477520
155aa03
hex46968

289128 has 32 divisors (see below), whose sum is σ = 826560. Its totient is φ = 82560.

The previous prime is 289127. The next prime is 289129. The reversal of 289128 is 821982.

It is an interprime number because it is at equal distance from previous prime (289127) and next prime (289129).

It is a nialpdrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 289095 and 289104.

It is not an unprimeable number, because it can be changed into a prime (289127) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 693 + ... + 1028.

It is an arithmetic number, because the mean of its divisors is an integer number (25830).

2289128 is an apocalyptic number.

289128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

289128 is an abundant number, since it is smaller than the sum of its proper divisors (537432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

289128 is a wasteful number, since it uses less digits than its factorization.

289128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1737 (or 1733 counting only the distinct ones).

The product of its digits is 2304, while the sum is 30.

The square root of 289128 is about 537.7062395026. The cubic root of 289128 is about 66.1246496504.

It can be divided in two parts, 28912 and 8, that added together give a triangular number (28920 = T240).

The spelling of 289128 in words is "two hundred eighty-nine thousand, one hundred twenty-eight".

Divisors: 1 2 3 4 6 7 8 12 14 21 24 28 42 56 84 168 1721 3442 5163 6884 10326 12047 13768 20652 24094 36141 41304 48188 72282 96376 144564 289128