51728831 has 24 divisors (see below), whose sum is σ = 65563680. Its totient is φ = 39948480.

The previous prime is 51728827. The next prime is 51728843. The reversal of 51728831 is 13882715.

It is not a de Polignac number, because 51728831 - 2² = 51728827 is a prime.

It is a super-2 number, since 2×51728831² = 5351743913253122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51728791 and 51728800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51728861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132785 + ... + 133173.

It is an arithmetic number, because the mean of its divisors is an integer number (2731820).

Almost surely, 2^51728831 is an apocalyptic number.

51728831 is a deficient number, since it is larger than the sum of its proper divisors (13834849).

51728831 is a wasteful number, since it uses less digits than its factorization.

51728831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575 (or 564 counting only the distinct ones).

The product of its digits is 13440, while the sum is 35.

The square root of 51728831 is about 7192.2757872596. The cubic root of 51728831 is about 372.6011760661.

The spelling of 51728831 in words is "fifty-one million, seven hundred twenty-eight thousand, eight hundred thirty-one".