63605 has 4 divisors (see below), whose sum is σ = 76332. Its totient is φ = 50880.

The previous prime is 63601. The next prime is 63607. The reversal of 63605 is 50636.

63605 = T₁₅₇ + T₁₅₈ + ... + T₁₆₁.

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 40804 + 22801 = 202^2 + 151^2 .

It is not a de Polignac number, because 63605 - 2² = 63601 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6356 + ... + 6365.

It is an arithmetic number, because the mean of its divisors is an integer number (19083).

2⁶³⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

63605 is a deficient number, since it is larger than the sum of its proper divisors (12727).

63605 is a wasteful number, since it uses less digits than its factorization.

63605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12726.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 63605 is about 252.2003172084. The cubic root of 63605 is about 39.9175384525.

The spelling of 63605 in words is "sixty-three thousand, six hundred five".