633789989 has 8 divisors (see below), whose sum is σ = 725358720. Its totient is φ = 542478096.

The previous prime is 633789979. The next prime is 633790019. The reversal of 633789989 is 989987336.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-633789989 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 (633789979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58889 + ... + 68814.

It is an arithmetic number, because the mean of its divisors is an integer number (90669840).

Almost surely, 2^633789989 is an apocalyptic number.

It is an amenable number.

633789989 is a deficient number, since it is larger than the sum of its proper divisors (91568731).

633789989 is a wasteful number, since it uses less digits than its factorization.

633789989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128419.

The product of its digits is 17635968, while the sum is 62.

The square root of 633789989 is about 25175.1859774660. The cubic root of 633789989 is about 858.9775070760.

The spelling of 633789989 in words is "six hundred thirty-three million, seven hundred eighty-nine thousand, nine hundred eighty-nine".