51689556 has 48 divisors (see below), whose sum is σ = 139843200. Its totient is φ = 16479936.

The previous prime is 51689551. The next prime is 51689563. The reversal of 51689556 is 65598615.

It is a happy number.

51689556 is a `hidden beast` number, since 5 + 16 + 89 + 556 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51689551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7921 + ... + 12888.

It is an arithmetic number, because the mean of its divisors is an integer number (2913400).

Almost surely, 2^51689556 is an apocalyptic number.

It is an amenable number.

51689556 is an abundant number, since it is smaller than the sum of its proper divisors (88153644).

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

51689556 is a wasteful number, since it uses less digits than its factorization.

51689556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20845 (or 20837 counting only the distinct ones).

The product of its digits is 324000, while the sum is 45.

The square root of 51689556 is about 7189.5449091024. The cubic root of 51689556 is about 372.5068533190.

The spelling of 51689556 in words is "fifty-one million, six hundred eighty-nine thousand, five hundred fifty-six".