638348485 has 4 divisors (see below), whose sum is σ = 766018188. Its totient is φ = 510678784.

The previous prime is 638348441. The next prime is 638348507. The reversal of 638348485 is 584843836.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 274034916 + 364313569 = 16554^2 + 19087^2 .

It is a cyclic number.

It is not a de Polignac number, because 638348485 - 2⁷ = 638348357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63834844 + ... + 63834853.

It is an arithmetic number, because the mean of its divisors is an integer number (191504547).

Almost surely, 2^638348485 is an apocalyptic number.

It is an amenable number.

638348485 is a deficient number, since it is larger than the sum of its proper divisors (127669703).

638348485 is a wasteful number, since it uses less digits than its factorization.

638348485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127669702.

The product of its digits is 2211840, while the sum is 49.

The square root of 638348485 is about 25265.5592655298. The cubic root of 638348485 is about 861.0319705678.

The spelling of 638348485 in words is "six hundred thirty-eight million, three hundred forty-eight thousand, four hundred eighty-five".