4878445638 has 64 divisors (see below), whose sum is σ = 10853821440. Its totient is φ = 1449446400.

The previous prime is 4878445619. The next prime is 4878445651. The reversal of 4878445638 is 8365448784.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 694323 + ... + 701313.

It is an arithmetic number, because the mean of its divisors is an integer number (169590960).

Almost surely, 2^4878445638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4878445638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5426910720).

4878445638 is an abundant number, since it is smaller than the sum of its proper divisors (5975375802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4878445638 is a wasteful number, since it uses less digits than its factorization.

4878445638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7213.

The product of its digits is 20643840, while the sum is 57.

The square root of 4878445638 is about 69845.8705865995. The cubic root of 4878445638 is about 1696.0051107428.

The spelling of 4878445638 in words is "four billion, eight hundred seventy-eight million, four hundred forty-five thousand, six hundred thirty-eight".