51171328 has 78 divisors (see below), whose sum is σ = 113871282. Its totient is φ = 22855680.

The previous prime is 51171319. The next prime is 51171331. The reversal of 51171328 is 82317115.

It can be written as a sum of positive squares in only one way, i.e., 35426304 + 15745024 = 5952^2 + 3968^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51171296 and 51171305.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1650673 + ... + 1650703.

Almost surely, 2^51171328 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 51171328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56935641).

51171328 is an abundant number, since it is smaller than the sum of its proper divisors (62699954).

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

51171328 is an equidigital number, since it uses as much as digits as its factorization.

51171328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99 (or 46 counting only the distinct ones).

The product of its digits is 1680, while the sum is 28.

The square root of 51171328 is about 7153.4137305206. The cubic root of 51171328 is about 371.2577793531.

The spelling of 51171328 in words is "fifty-one million, one hundred seventy-one thousand, three hundred twenty-eight".