6438638152 has 16 divisors (see below), whose sum is σ = 12076034940. Its totient is φ = 3218362176.

The previous prime is 6438638083. The next prime is 6438638197. The reversal of 6438638152 is 2518368346.

It can be written as a sum of positive squares in 2 ways, for example, as 6423381316 + 15256836 = 80146^2 + 3906^2 .

It is a super-2 number, since 2×6438638152² = 82912122504779950208, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90603 + ... + 145210.

Almost surely, 2^6438638152 is an apocalyptic number.

It is an amenable number.

6438638152 is a deficient number, since it is larger than the sum of its proper divisors (5637396788).

6438638152 is a wasteful number, since it uses less digits than its factorization.

6438638152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239232 (or 239228 counting only the distinct ones).

The product of its digits is 829440, while the sum is 46.

The square root of 6438638152 is about 80241.1250668882. The cubic root of 6438638152 is about 1860.3643399278.

The spelling of 6438638152 in words is "six billion, four hundred thirty-eight million, six hundred thirty-eight thousand, one hundred fifty-two".