63998 has 8 divisors (see below), whose sum is σ = 104760. Its totient is φ = 29080.

The previous prime is 63997. The next prime is 64007. The reversal of 63998 is 89936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 63998.

It is not an unprimeable number, because it can be changed into a prime (63997) 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, 1433 + ... + 1476.

It is an arithmetic number, because the mean of its divisors is an integer number (13095).

2⁶³⁹⁹⁸ is an apocalyptic number.

63998 is a deficient number, since it is larger than the sum of its proper divisors (40762).

63998 is a wasteful number, since it uses less digits than its factorization.

63998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2922.

The product of its digits is 11664, while the sum is 35.

The square root of 63998 is about 252.9782599355. The cubic root of 63998 is about 39.9995833290. Note that the first 3 decimals are identical.

It can be divided in two parts, 639 and 98, that added together give a palindrome (737).

The spelling of 63998 in words is "sixty-three thousand, nine hundred ninety-eight".