638828954 has 8 divisors (see below), whose sum is σ = 981615348. Its totient is φ = 311623840.

The previous prime is 638828951. The next prime is 638829017. The reversal of 638828954 is 459828836.

It can be written as a sum of positive squares in 2 ways, for example, as 433680625 + 205148329 = 20825^2 + 14323^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 638828896 and 638828905.

It is not an unprimeable number, because it can be changed into a prime (638828951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3895217 + ... + 3895380.

Almost surely, 2^638828954 is an apocalyptic number.

638828954 is a deficient number, since it is larger than the sum of its proper divisors (342786394).

638828954 is a wasteful number, since it uses less digits than its factorization.

638828954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7790640.

The product of its digits is 3317760, while the sum is 53.

The square root of 638828954 is about 25275.0658555027. The cubic root of 638828954 is about 861.2479421618.

The spelling of 638828954 in words is "six hundred thirty-eight million, eight hundred twenty-eight thousand, nine hundred fifty-four".