53645 has 4 divisors (see below), whose sum is σ = 64380. Its totient is φ = 42912.

The previous prime is 53639. The next prime is 53653. The reversal of 53645 is 54635.

53645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29929 + 23716 = 173^2 + 154^2 .

It is a cyclic number.

It is not a de Polignac number, because 53645 - 2⁴ = 53629 is a prime.

It is a super-3 number, since 3×53645³ = 463136493933375, which contains 333 as substring.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 53645.

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, 5360 + ... + 5369.

It is an arithmetic number, because the mean of its divisors is an integer number (16095).

2⁵³⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

53645 is a deficient number, since it is larger than the sum of its proper divisors (10735).

53645 is a wasteful number, since it uses less digits than its factorization.

53645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10734.

The product of its digits is 1800, while the sum is 23.

The square root of 53645 is about 231.6139028642. The cubic root of 53645 is about 37.7146211818.

Subtracting 53645 from its reverse (54635), we obtain a triangular number (990 = T₄₄).

It can be divided in two parts, 5 and 3645, that multiplied together give a square (18225 = 135²).

The spelling of 53645 in words is "fifty-three thousand, six hundred forty-five".