5138728 has 24 divisors (see below), whose sum is σ = 11209050. Its totient is φ = 2202144.

The previous prime is 5138719. The next prime is 5138747. The reversal of 5138728 is 8278315.

It can be written as a sum of positive squares in only one way, i.e., 4588164 + 550564 = 2142^2 + 742^2 .

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 5138693 and 5138702.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6163 + ... + 6946.

Almost surely, 2^5138728 is an apocalyptic number.

It is an amenable number.

5138728 is an abundant number, since it is smaller than the sum of its proper divisors (6070322).

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

5138728 is a wasteful number, since it uses less digits than its factorization.

5138728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13129 (or 13118 counting only the distinct ones).

The product of its digits is 13440, while the sum is 34.

The square root of 5138728 is about 2266.8762648191. The cubic root of 5138728 is about 172.5646666461.

It can be divided in two parts, 51387 and 28, that added together give a palindrome (51415).

The spelling of 5138728 in words is "five million, one hundred thirty-eight thousand, seven hundred twenty-eight".