638137346 has 64 divisors (see below), whose sum is σ = 1264343040. Its totient is φ = 234178560.

The previous prime is 638137343. The next prime is 638137361. The reversal of 638137346 is 643731836.

It is not an unprimeable number, because it can be changed into a prime (638137343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 235970 + ... + 238658.

It is an arithmetic number, because the mean of its divisors is an integer number (19755360).

Almost surely, 2^638137346 is an apocalyptic number.

638137346 is a deficient number, since it is larger than the sum of its proper divisors (626205694).

638137346 is a wasteful number, since it uses less digits than its factorization.

638137346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2799.

The product of its digits is 217728, while the sum is 41.

The square root of 638137346 is about 25261.3805244290. The cubic root of 638137346 is about 860.9370289693.

The spelling of 638137346 in words is "six hundred thirty-eight million, one hundred thirty-seven thousand, three hundred forty-six".