5251816728 has 24 divisors (see below), whose sum is σ = 14223670500. Its totient is φ = 1750605552.

The previous prime is 5251816721. The next prime is 5251816763. The reversal of 5251816728 is 8276181525.

5251816728 is a `hidden beast` number, since 52 + 518 + 1 + 67 + 28 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5251816721) 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 5 ways as a sum of consecutive naturals, for example, 36470878 + ... + 36471021.

Almost surely, 2^5251816728 is an apocalyptic number.

It is an amenable number.

5251816728 is an abundant number, since it is smaller than the sum of its proper divisors (8971853772).

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

5251816728 is a wasteful number, since it uses less digits than its factorization.

5251816728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72941911 (or 72941904 counting only the distinct ones).

The product of its digits is 268800, while the sum is 45.

The square root of 5251816728 is about 72469.4192608165. The cubic root of 5251816728 is about 1738.2137753529.

The spelling of 5251816728 in words is "five billion, two hundred fifty-one million, eight hundred sixteen thousand, seven hundred twenty-eight".