73663 has 4 divisors (see below), whose sum is σ = 77560. Its totient is φ = 69768.

The previous prime is 73651. The next prime is 73673. The reversal of 73663 is 36637.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-73663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1920 + ... + 1957.

It is an arithmetic number, because the mean of its divisors is an integer number (19390).

2⁷³⁶⁶³ is an apocalyptic number.

73663 is a deficient number, since it is larger than the sum of its proper divisors (3897).

73663 is a wasteful number, since it uses less digits than its factorization.

73663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3896.

The product of its digits is 2268, while the sum is 25.

The square root of 73663 is about 271.4092850291. The cubic root of 73663 is about 41.9195360432.

The spelling of 73663 in words is "seventy-three thousand, six hundred sixty-three".