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71689 = 174217
BaseRepresentation
bin10001100000001001
310122100011
4101200021
54243224
61311521
7416002
oct214011
9118304
1071689
1149952
12355a1
1326827
141c1a9
1516394
hex11809

71689 has 4 divisors (see below), whose sum is σ = 75924. Its totient is φ = 67456.

The previous prime is 71671. The next prime is 71693. The reversal of 71689 is 98617.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98617 = 175801.

It can be written as a sum of positive squares in 2 ways, for example, as 60025 + 11664 = 245^2 + 108^2 .

It is not a de Polignac number, because 71689 - 215 = 38921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71689.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2092 + ... + 2125.

It is an arithmetic number, because the mean of its divisors is an integer number (18981).

271689 is an apocalyptic number.

It is an amenable number.

71689 is a deficient number, since it is larger than the sum of its proper divisors (4235).

71689 is a wasteful number, since it uses less digits than its factorization.

71689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4234.

The product of its digits is 3024, while the sum is 31.

The square root of 71689 is about 267.7480158657. The cubic root of 71689 is about 41.5416913003.

The spelling of 71689 in words is "seventy-one thousand, six hundred eighty-nine".

Divisors: 1 17 4217 71689