51728516 has 48 divisors (see below), whose sum is σ = 108528000. Its totient is φ = 21549024.

The previous prime is 51728513. The next prime is 51728519. The reversal of 51728516 is 61582715.

It is an interprime number because it is at equal distance from previous prime (51728513) and next prime (51728519).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51728513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50255 + ... + 51273.

It is an arithmetic number, because the mean of its divisors is an integer number (2261000).

Almost surely, 2^51728516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51728516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54264000).

51728516 is an abundant number, since it is smaller than the sum of its proper divisors (56799484).

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

51728516 is a wasteful number, since it uses less digits than its factorization.

51728516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081 (or 1065 counting only the distinct ones).

The product of its digits is 16800, while the sum is 35.

The square root of 51728516 is about 7192.2538887334. The cubic root of 51728516 is about 372.6004197528.

The spelling of 51728516 in words is "fifty-one million, seven hundred twenty-eight thousand, five hundred sixteen".