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128580 = 22352143
BaseRepresentation
bin11111011001000100
320112101020
4133121010
513103310
62431140
71043604
oct373104
9215336
10128580
1188671
12624b0
13466aa
1434c04
1528170
hex1f644

128580 has 24 divisors (see below), whose sum is σ = 360192. Its totient is φ = 34272.

The previous prime is 128563. The next prime is 128591. The reversal of 128580 is 85821.

It is an Ulam number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 128580.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1012 + ... + 1131.

It is an arithmetic number, because the mean of its divisors is an integer number (15008).

2128580 is an apocalyptic number.

128580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128580 is an abundant number, since it is smaller than the sum of its proper divisors (231612).

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

128580 is a wasteful number, since it uses less digits than its factorization.

128580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2155 (or 2153 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 128580 is about 358.5805348872. The cubic root of 128580 is about 50.4728475412.

The spelling of 128580 in words is "one hundred twenty-eight thousand, five hundred eighty".

Divisors: 1 2 3 4 5 6 10 12 15 20 30 60 2143 4286 6429 8572 10715 12858 21430 25716 32145 42860 64290 128580