51689328 has 20 divisors (see below), whose sum is σ = 133530888. Its totient is φ = 17229760.

The previous prime is 51689327. The next prime is 51689347. The reversal of 51689328 is 82398615.

51689328 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 51689328.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51689321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 538383 + ... + 538478.

Almost surely, 2^51689328 is an apocalyptic number.

It is an amenable number.

51689328 is an abundant number, since it is smaller than the sum of its proper divisors (81841560).

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

51689328 is a wasteful number, since it uses less digits than its factorization.

51689328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076872 (or 1076866 counting only the distinct ones).

The product of its digits is 103680, while the sum is 42.

The square root of 51689328 is about 7189.5290527266. The cubic root of 51689328 is about 372.5063056152.

The spelling of 51689328 in words is "fifty-one million, six hundred eighty-nine thousand, three hundred twenty-eight".