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680840 = 23517021
BaseRepresentation
bin10100110001110001000
31021120221022
42212032020
5133241330
622332012
75533646
oct2461610
91246838
10680840
11425586
1228a008
131aab84
1413a196
15d6ae5
hexa6388

680840 has 16 divisors (see below), whose sum is σ = 1531980. Its totient is φ = 272320.

The previous prime is 680831. The next prime is 680857. The reversal of 680840 is 48086.

It can be written as a sum of positive squares in 2 ways, for example, as 643204 + 37636 = 802^2 + 194^2 .

It is an unprimeable number.

680840 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8471 + ... + 8550.

2680840 is an apocalyptic number.

It is an amenable number.

680840 is an abundant number, since it is smaller than the sum of its proper divisors (851140).

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

680840 is a wasteful number, since it uses less digits than its factorization.

680840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17032 (or 17028 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 680840 is about 825.1302927417. The cubic root of 680840 is about 87.9727877293.

The spelling of 680840 in words is "six hundred eighty thousand, eight hundred forty".

Divisors: 1 2 4 5 8 10 20 40 17021 34042 68084 85105 136168 170210 340420 680840