51540728 has 8 divisors (see below), whose sum is σ = 96638880. Its totient is φ = 25770360.

The previous prime is 51540707. The next prime is 51540757. The reversal of 51540728 is 82704515.

51540728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 51540694 and 51540703.

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 as a sum of consecutive naturals, namely, 3221288 + ... + 3221303.

It is an arithmetic number, because the mean of its divisors is an integer number (12079860).

Almost surely, 2^51540728 is an apocalyptic number.

It is an amenable number.

51540728 is a deficient number, since it is larger than the sum of its proper divisors (45098152).

51540728 is a wasteful number, since it uses less digits than its factorization.

51540728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6442597 (or 6442593 counting only the distinct ones).

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

The square root of 51540728 is about 7179.1871406170. The cubic root of 51540728 is about 372.1489941571.

The spelling of 51540728 in words is "fifty-one million, five hundred forty thousand, seven hundred twenty-eight".