634722989 has 8 divisors (see below), whose sum is σ = 638227512. Its totient is φ = 631225600.

The previous prime is 634722983. The next prime is 634723039. The reversal of 634722989 is 989227436.

It can be written as a sum of positive squares in 4 ways, for example, as 17598025 + 617124964 = 4195^2 + 24842^2 .

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 634722989 - 2¹⁶ = 634657453 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634722983) 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, 332939 + ... + 334839.

It is an arithmetic number, because the mean of its divisors is an integer number (79778439).

Almost surely, 2^634722989 is an apocalyptic number.

It is an amenable number.

634722989 is a deficient number, since it is larger than the sum of its proper divisors (3504523).

634722989 is a wasteful number, since it uses less digits than its factorization.

634722989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3567.

The product of its digits is 1306368, while the sum is 50.

The square root of 634722989 is about 25193.7093140331. The cubic root of 634722989 is about 859.3987996653.

The spelling of 634722989 in words is "six hundred thirty-four million, seven hundred twenty-two thousand, nine hundred eighty-nine".