638326285 has 8 divisors (see below), whose sum is σ = 811049976. Its totient is φ = 480622080.

The previous prime is 638326277. The next prime is 638326303. The reversal of 638326285 is 582623836.

It can be written as a sum of positive squares in 4 ways, for example, as 332041284 + 306285001 = 18222^2 + 17501^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 638326285 - 2³ = 638326277 is a prime.

It is a super-2 number, since 2×638326285² = 814920892243802450, which contains 22 as substring.

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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3754776 + ... + 3754945.

It is an arithmetic number, because the mean of its divisors is an integer number (101381247).

Almost surely, 2^638326285 is an apocalyptic number.

It is an amenable number.

638326285 is a deficient number, since it is larger than the sum of its proper divisors (172723691).

638326285 is a wasteful number, since it uses less digits than its factorization.

638326285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7509743.

The product of its digits is 414720, while the sum is 43.

The square root of 638326285 is about 25265.1199284706. The cubic root of 638326285 is about 861.0219890129.

The spelling of 638326285 in words is "six hundred thirty-eight million, three hundred twenty-six thousand, two hundred eighty-five".