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80840 = 2354347
BaseRepresentation
bin10011101111001000
311002220002
4103233020
510041330
61422132
7454454
oct235710
9132802
1080840
1155811
123a948
132aa46
1421664
1518e45
hex13bc8

80840 has 32 divisors (see below), whose sum is σ = 190080. Its totient is φ = 30912.

The previous prime is 80833. The next prime is 80849. The reversal of 80840 is 4808.

80840 is nontrivially palindromic in base 7.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80849) 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, 1697 + ... + 1743.

It is an arithmetic number, because the mean of its divisors is an integer number (5940).

280840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95040).

80840 is an abundant number, since it is smaller than the sum of its proper divisors (109240).

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

80840 is a wasteful number, since it uses less digits than its factorization.

80840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 80840 is about 284.3237591198. The cubic root of 80840 is about 43.2389794501.

It can be divided in two parts, 808 and 40, that added together give a palindrome (848).

The spelling of 80840 in words is "eighty thousand, eight hundred forty".

Divisors: 1 2 4 5 8 10 20 40 43 47 86 94 172 188 215 235 344 376 430 470 860 940 1720 1880 2021 4042 8084 10105 16168 20210 40420 80840