63905 has 4 divisors (see below), whose sum is σ = 76692. Its totient is φ = 51120.

The previous prime is 63901. The next prime is 63907. The reversal of 63905 is 50936.

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 35344 + 28561 = 188^2 + 169^2 .

It is not a de Polignac number, because 63905 - 2² = 63901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63901) 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, 6386 + ... + 6395.

It is an arithmetic number, because the mean of its divisors is an integer number (19173).

2⁶³⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

63905 is a deficient number, since it is larger than the sum of its proper divisors (12787).

63905 is a wasteful number, since it uses less digits than its factorization.

63905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12786.

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 63905 is about 252.7943828490. The cubic root of 63905 is about 39.9801985325.

The spelling of 63905 in words is "sixty-three thousand, nine hundred five".