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7685 = 52953
BaseRepresentation
bin1111000000101
3101112122
41320011
5221220
655325
731256
oct17005
911478
107685
115857
124545
133662
142b2d
152425
hex1e05

7685 has 8 divisors (see below), whose sum is σ = 9720. Its totient is φ = 5824.

The previous prime is 7681. The next prime is 7687. The reversal of 7685 is 5867.

7685 is an esthetic number in base 12, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in 4 ways, for example, as 1444 + 6241 = 38^2 + 79^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7685 - 22 = 7681 is a prime.

7685 is an undulating number in base 12.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7681) 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, 119 + ... + 171.

It is an arithmetic number, because the mean of its divisors is an integer number (1215).

27685 is an apocalyptic number.

It is an amenable number.

7685 is a deficient number, since it is larger than the sum of its proper divisors (2035).

7685 is a wasteful number, since it uses less digits than its factorization.

7685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87.

The product of its digits is 1680, while the sum is 26.

The square root of 7685 is about 87.6641317758. The cubic root of 7685 is about 19.7339772840.

It can be divided in two parts, 76 and 85, that added together give a palindrome (161).

The spelling of 7685 in words is "seven thousand, six hundred eighty-five".

Divisors: 1 5 29 53 145 265 1537 7685