634784989 has 8 divisors (see below), whose sum is σ = 641323008. Its totient is φ = 628271280.

The previous prime is 634784977. The next prime is 634784999. The reversal of 634784989 is 989487436.

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

It is a cyclic number.

It is not a de Polignac number, because 634784989 - 2⁹ = 634784477 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 (634784929) 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, 48939 + ... + 60535.

It is an arithmetic number, because the mean of its divisors is an integer number (80165376).

Almost surely, 2^634784989 is an apocalyptic number.

It is an amenable number.

634784989 is a deficient number, since it is larger than the sum of its proper divisors (6538019).

634784989 is a wasteful number, since it uses less digits than its factorization.

634784989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12155.

The product of its digits is 10450944, while the sum is 58.

The square root of 634784989 is about 25194.9397498783. The cubic root of 634784989 is about 859.4267808958.

The spelling of 634784989 in words is "six hundred thirty-four million, seven hundred eighty-four thousand, nine hundred eighty-nine".