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80505 = 3251789
BaseRepresentation
bin10011101001111001
311002102200
4103221321
510034010
61420413
7453465
oct235171
9132380
1080505
1155537
123a709
132a849
14214a5
1518cc0
hex13a79

80505 has 12 divisors (see below), whose sum is σ = 139620. Its totient is φ = 42912.

The previous prime is 80491. The next prime is 80513. The reversal of 80505 is 50508.

It can be written as a sum of positive squares in 2 ways, for example, as 56169 + 24336 = 237^2 + 156^2 .

It is not a de Polignac number, because 80505 - 24 = 80489 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 850 + ... + 939.

It is an arithmetic number, because the mean of its divisors is an integer number (11635).

280505 is an apocalyptic number.

It is an amenable number.

80505 is a deficient number, since it is larger than the sum of its proper divisors (59115).

80505 is a wasteful number, since it uses less digits than its factorization.

80505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1800 (or 1797 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 80505 is about 283.7340303876. The cubic root of 80505 is about 43.1791694841.

It can be divided in two parts, 80 and 505, that added together give a palindrome (585).

The spelling of 80505 in words is "eighty thousand, five hundred five".

Divisors: 1 3 5 9 15 45 1789 5367 8945 16101 26835 80505