634479989 has 8 divisors (see below), whose sum is σ = 745403232. Its totient is φ = 532430640.

The previous prime is 634479943. The next prime is 634479991. The reversal of 634479989 is 989974436.

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 634479989 - 2¹² = 634475893 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 (634479929) 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, 2218319 + ... + 2218604.

It is an arithmetic number, because the mean of its divisors is an integer number (93175404).

Almost surely, 2^634479989 is an apocalyptic number.

It is an amenable number.

634479989 is a deficient number, since it is larger than the sum of its proper divisors (110923243).

634479989 is a wasteful number, since it uses less digits than its factorization.

634479989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4436947.

The product of its digits is 11757312, while the sum is 59.

The square root of 634479989 is about 25188.8862199185. The cubic root of 634479989 is about 859.2891137247.

The spelling of 634479989 in words is "six hundred thirty-four million, four hundred seventy-nine thousand, nine hundred eighty-nine".