638053217 has 4 divisors (see below), whose sum is σ = 646129920. Its totient is φ = 629976516.

The previous prime is 638053211. The next prime is 638053243. The reversal of 638053217 is 712350836.

638053217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 638053217 - 2¹² = 638049121 is a prime.

It is a super-2 number, since 2×638053217² = 814223815448098178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638053211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4038233 + ... + 4038390.

It is an arithmetic number, because the mean of its divisors is an integer number (161532480).

Almost surely, 2^638053217 is an apocalyptic number.

It is an amenable number.

638053217 is a deficient number, since it is larger than the sum of its proper divisors (8076703).

638053217 is an equidigital number, since it uses as much as digits as its factorization.

638053217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8076702.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 638053217 is about 25259.7152992665. The cubic root of 638053217 is about 860.8991933556.

The spelling of 638053217 in words is "six hundred thirty-eight million, fifty-three thousand, two hundred seventeen".