635998 has 8 divisors (see below), whose sum is σ = 1040760. Its totient is φ = 289080.

The previous prime is 635989. The next prime is 636017. The reversal of 635998 is 899536.

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

It is a self number, because there is not a number n which added to its sum of digits gives 635998.

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 635998.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14433 + ... + 14476.

It is an arithmetic number, because the mean of its divisors is an integer number (130095).

2⁶³⁵⁹⁹⁸ is an apocalyptic number.

635998 is a deficient number, since it is larger than the sum of its proper divisors (404762).

635998 is a wasteful number, since it uses less digits than its factorization.

635998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28922.

The product of its digits is 58320, while the sum is 40.

The square root of 635998 is about 797.4948275694. The cubic root of 635998 is about 85.9973858949.

The spelling of 635998 in words is "six hundred thirty-five thousand, nine hundred ninety-eight".