518122728 has 48 divisors (see below), whose sum is σ = 1417162500. Its totient is φ = 170995200.

The previous prime is 518122711. The next prime is 518122739. The reversal of 518122728 is 827221815.

It can be written as a sum of positive squares in 2 ways, for example, as 369331524 + 148791204 = 19218^2 + 12198^2 .

It is a super-2 number, since 2×518122728² = 536902322540323968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 518122692 and 518122701.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28353 + ... + 42896.

Almost surely, 2^518122728 is an apocalyptic number.

It is an amenable number.

518122728 is an abundant number, since it is smaller than the sum of its proper divisors (899039772).

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

518122728 is a wasteful number, since it uses less digits than its factorization.

518122728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71362 (or 71355 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 518122728 is about 22762.3093731721. The cubic root of 518122728 is about 803.1762930959.

The spelling of 518122728 in words is "five hundred eighteen million, one hundred twenty-two thousand, seven hundred twenty-eight".