638094605 has 4 divisors (see below), whose sum is σ = 765713532. Its totient is φ = 510475680.

The previous prime is 638094601. The next prime is 638094619. The reversal of 638094605 is 506490836.

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 122168809 + 515925796 = 11053^2 + 22714^2 .

It is not a de Polignac number, because 638094605 - 2² = 638094601 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 (638094601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63809456 + ... + 63809465.

It is an arithmetic number, because the mean of its divisors is an integer number (191428383).

Almost surely, 2^638094605 is an apocalyptic number.

It is an amenable number.

638094605 is a deficient number, since it is larger than the sum of its proper divisors (127618927).

638094605 is a wasteful number, since it uses less digits than its factorization.

638094605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127618926.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 638094605 is about 25260.5345351202. The cubic root of 638094605 is about 860.9178073335.

The spelling of 638094605 in words is "six hundred thirty-eight million, ninety-four thousand, six hundred five".