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33445 = 56689
BaseRepresentation
bin1000001010100101
31200212201
420022211
52032240
6414501
7166336
oct101245
950781
1033445
1123145
1217431
13122b9
14c28d
159d9a
hex82a5

33445 has 4 divisors (see below), whose sum is σ = 40140. Its totient is φ = 26752.

The previous prime is 33427. The next prime is 33457. The reversal of 33445 is 54433.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54433 = 291877.

It can be written as a sum of positive squares in 2 ways, for example, as 20449 + 12996 = 143^2 + 114^2 .

It is a cyclic number.

It is not a de Polignac number, because 33445 - 25 = 33413 is a prime.

It is a super-2 number, since 2×334452 = 2237136050, which contains 22 as substring.

It is an Ulam number.

33445 is a lucky number.

It is a plaindrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3340 + ... + 3349.

It is an arithmetic number, because the mean of its divisors is an integer number (10035).

233445 is an apocalyptic number.

It is an amenable number.

33445 is a deficient number, since it is larger than the sum of its proper divisors (6695).

33445 is an equidigital number, since it uses as much as digits as its factorization.

33445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6694.

The product of its digits is 720, while the sum is 19.

The square root of 33445 is about 182.8797419071. The cubic root of 33445 is about 32.2188770914.

Adding to 33445 its reverse (54433), we get a palindrome (87878).

The spelling of 33445 in words is "thirty-three thousand, four hundred forty-five".

Divisors: 1 5 6689 33445