633990 has 32 divisors (see below), whose sum is σ = 1739520. Its totient is φ = 144864.

The previous prime is 633967. The next prime is 633991. The reversal of 633990 is 99336.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (633991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1300 + ... + 1719.

It is an arithmetic number, because the mean of its divisors is an integer number (54360).

2⁶³³⁹⁹⁰ is an apocalyptic number.

633990 is an abundant number, since it is smaller than the sum of its proper divisors (1105530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

633990 is a wasteful number, since it uses less digits than its factorization.

633990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3036.

The product of its (nonzero) digits is 4374, while the sum is 30.

The square root of 633990 is about 796.2348899665. The cubic root of 633990 is about 85.9067856079.

The spelling of 633990 in words is "six hundred thirty-three thousand, nine hundred ninety".