51971728 has 20 divisors (see below), whose sum is σ = 101829420. Its totient is φ = 25693184.

The previous prime is 51971713. The next prime is 51971729. The reversal of 51971728 is 82717915.

It can be written as a sum of positive squares in 2 ways, for example, as 36385024 + 15586704 = 6032^2 + 3948^2 .

It is a super-2 number, since 2×51971728² = 5402121022611968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51971729) 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, 16825 + ... + 19672.

It is an arithmetic number, because the mean of its divisors is an integer number (5091471).

Almost surely, 2^51971728 is an apocalyptic number.

It is an amenable number.

51971728 is a deficient number, since it is larger than the sum of its proper divisors (49857692).

51971728 is a wasteful number, since it uses less digits than its factorization.

51971728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36594 (or 36588 counting only the distinct ones).

The product of its digits is 35280, while the sum is 40.

The square root of 51971728 is about 7209.1419739106. The cubic root of 51971728 is about 373.1834588319.

The spelling of 51971728 in words is "fifty-one million, nine hundred seventy-one thousand, seven hundred twenty-eight".