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68965 = 5131061
BaseRepresentation
bin10000110101100101
310111121021
4100311211
54201330
61251141
7405031
oct206545
9114537
1068965
11478a6
1233ab1
1325510
141b1c1
151567a
hex10d65

68965 has 8 divisors (see below), whose sum is σ = 89208. Its totient is φ = 50880.

The previous prime is 68963. The next prime is 68993. The reversal of 68965 is 56986.

It can be written as a sum of positive squares in 4 ways, for example, as 2916 + 66049 = 54^2 + 257^2 .

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

It is not a de Polignac number, because 68965 - 21 = 68963 is a prime.

It is a Duffinian number.

68965 is a lucky number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 68965.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68963) 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, 466 + ... + 595.

It is an arithmetic number, because the mean of its divisors is an integer number (11151).

268965 is an apocalyptic number.

68965 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

68965 is a deficient number, since it is larger than the sum of its proper divisors (20243).

68965 is a wasteful number, since it uses less digits than its factorization.

68965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079.

The product of its digits is 12960, while the sum is 34.

The square root of 68965 is about 262.6118809194. The cubic root of 68965 is about 41.0087231092.

The spelling of 68965 in words is "sixty-eight thousand, nine hundred sixty-five".

Divisors: 1 5 13 65 1061 5305 13793 68965