5278516638 has 16 divisors (see below), whose sum is σ = 10684227456. Its totient is φ = 1738306520.

The previous prime is 5278516619. The next prime is 5278516667. The reversal of 5278516638 is 8366158725.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5299218 + ... + 5300213.

It is an arithmetic number, because the mean of its divisors is an integer number (667764216).

Almost surely, 2^5278516638 is an apocalyptic number.

5278516638 is an abundant number, since it is smaller than the sum of its proper divisors (5405710818).

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

5278516638 is a wasteful number, since it uses less digits than its factorization.

5278516638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10599519.

The product of its digits is 2419200, while the sum is 51.

The square root of 5278516638 is about 72653.4007325191. The cubic root of 5278516638 is about 1741.1544545104.

The spelling of 5278516638 in words is "five billion, two hundred seventy-eight million, five hundred sixteen thousand, six hundred thirty-eight".