51500728 has 16 divisors (see below), whose sum is σ = 96689880. Its totient is φ = 25716768.

The previous prime is 51500719. The next prime is 51500731. The reversal of 51500728 is 82700515.

51500728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 51500696 and 51500705.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3051 + ... + 10597.

Almost surely, 2^51500728 is an apocalyptic number.

It is an amenable number.

51500728 is a deficient number, since it is larger than the sum of its proper divisors (45189152).

51500728 is a wasteful number, since it uses less digits than its factorization.

51500728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8406 (or 8402 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 51500728 is about 7176.4007691879. The cubic root of 51500728 is about 372.0526961230.

The spelling of 51500728 in words is "fifty-one million, five hundred thousand, seven hundred twenty-eight".