51856818 has 32 divisors (see below), whose sum is σ = 111967296. Its totient is φ = 15916608.

The previous prime is 51856799. The next prime is 51856867. The reversal of 51856818 is 81865815.

It is a happy number.

51856818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 51856818.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 56721 + ... + 57627.

It is an arithmetic number, because the mean of its divisors is an integer number (3498978).

Almost surely, 2^51856818 is an apocalyptic number.

51856818 is an abundant number, since it is smaller than the sum of its proper divisors (60110478).

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

51856818 is a wasteful number, since it uses less digits than its factorization.

51856818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658.

The product of its digits is 76800, while the sum is 42.

The square root of 51856818 is about 7201.1678219578. The cubic root of 51856818 is about 372.9082184507.

The spelling of 51856818 in words is "fifty-one million, eight hundred fifty-six thousand, eight hundred eighteen".