638063871 has 16 divisors (see below), whose sum is σ = 897959040. Its totient is φ = 401893920.

The previous prime is 638063821. The next prime is 638063903. The reversal of 638063871 is 178360836.

It is not a de Polignac number, because 638063871 - 2⁶ = 638063807 is a prime.

It is a super-3 number, since 3×638063871³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638063801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6256 + ... + 36266.

It is an arithmetic number, because the mean of its divisors is an integer number (56122440).

Almost surely, 2^638063871 is an apocalyptic number.

638063871 is a deficient number, since it is larger than the sum of its proper divisors (259895169).

638063871 is a wasteful number, since it uses less digits than its factorization.

638063871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30406.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 638063871 is about 25259.9261875406. The cubic root of 638063871 is about 860.9039849982.

The spelling of 638063871 in words is "six hundred thirty-eight million, sixty-three thousand, eight hundred seventy-one".