51728065 has 4 divisors (see below), whose sum is σ = 62073684. Its totient is φ = 41382448.

The previous prime is 51728041. The next prime is 51728069. The reversal of 51728065 is 56082715.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25441936 + 26286129 = 5044^2 + 5127^2 .

It is a cyclic number.

It is not a de Polignac number, because 51728065 - 2¹⁵ = 51695297 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51728065.

It is not an unprimeable number, because it can be changed into a prime (51728069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5172802 + ... + 5172811.

It is an arithmetic number, because the mean of its divisors is an integer number (15518421).

Almost surely, 2^51728065 is an apocalyptic number.

It is an amenable number.

51728065 is a deficient number, since it is larger than the sum of its proper divisors (10345619).

51728065 is a wasteful number, since it uses less digits than its factorization.

51728065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10345618.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 51728065 is about 7192.2225354893. Note that the first 3 decimals coincide. The cubic root of 51728065 is about 372.5993368989.

It can be divided in two parts, 517 and 28065, that added together give a palindrome (28582).

The spelling of 51728065 in words is "fifty-one million, seven hundred twenty-eight thousand, sixty-five".