51045728 has 24 divisors (see below), whose sum is σ = 100928520. Its totient is φ = 25413120.

The previous prime is 51045719. The next prime is 51045733. The reversal of 51045728 is 82754015.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 51045694 and 51045703.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4403 + ... + 11021.

It is an arithmetic number, because the mean of its divisors is an integer number (4205355).

Almost surely, 2^51045728 is an apocalyptic number.

It is an amenable number.

51045728 is a deficient number, since it is larger than the sum of its proper divisors (49882792).

51045728 is a wasteful number, since it uses less digits than its factorization.

51045728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6870 (or 6862 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 51045728 is about 7144.6293115878. The cubic root of 51045728 is about 370.9537798146.

The spelling of 51045728 in words is "fifty-one million, forty-five thousand, seven hundred twenty-eight".