633420643 has 4 divisors (see below), whose sum is σ = 637082208. Its totient is φ = 629759080.

The previous prime is 633420631. The next prime is 633420661. The reversal of 633420643 is 346024336.

633420643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 633420643 - 2¹⁷ = 633289571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (633421643) 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, 1830523 + ... + 1830868.

It is an arithmetic number, because the mean of its divisors is an integer number (159270552).

Almost surely, 2^633420643 is an apocalyptic number.

633420643 is a deficient number, since it is larger than the sum of its proper divisors (3661565).

633420643 is a wasteful number, since it uses less digits than its factorization.

633420643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3661564.

The product of its (nonzero) digits is 31104, while the sum is 31.

The square root of 633420643 is about 25167.8493916346. The cubic root of 633420643 is about 858.8106160656.

Adding to 633420643 its reverse (346024336), we get a palindrome (979444979).

The spelling of 633420643 in words is "six hundred thirty-three million, four hundred twenty thousand, six hundred forty-three".