Search a number
-
+
685680 = 24352857
BaseRepresentation
bin10100111011001110000
31021211120120
42213121300
5133420210
622410240
75554032
oct2473160
91254516
10685680
11429186
12290980
131b0138
1413bc52
15d8270
hexa7670

685680 has 40 divisors (see below), whose sum is σ = 2126352. Its totient is φ = 182784.

The previous prime is 685679. The next prime is 685697. The reversal of 685680 is 86586.

685680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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, 1189 + ... + 1668.

2685680 is an apocalyptic number.

685680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

685680 is an abundant number, since it is smaller than the sum of its proper divisors (1440672).

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

685680 is a wasteful number, since it uses less digits than its factorization.

685680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2873 (or 2867 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 685680 is about 828.0579689853. The cubic root of 685680 is about 88.1807579334.

The spelling of 685680 in words is "six hundred eighty-five thousand, six hundred eighty".

Divisors: 1 2 3 4 5 6 8 10 12 15 16 20 24 30 40 48 60 80 120 240 2857 5714 8571 11428 14285 17142 22856 28570 34284 42855 45712 57140 68568 85710 114280 137136 171420 228560 342840 685680