51808212 has 36 divisors (see below), whose sum is σ = 137854080. Its totient is φ = 16360272.

The previous prime is 51808199. The next prime is 51808217. The reversal of 51808212 is 21280815.

51808212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51808217) 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 11 ways as a sum of consecutive naturals, for example, 37188 + ... + 38555.

It is an arithmetic number, because the mean of its divisors is an integer number (3829280).

Almost surely, 2^51808212 is an apocalyptic number.

It is an amenable number.

51808212 is an abundant number, since it is smaller than the sum of its proper divisors (86045868).

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

51808212 is a wasteful number, since it uses less digits than its factorization.

51808212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75772 (or 75767 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 51808212 is about 7197.7921614895. The cubic root of 51808212 is about 372.7916716228.

The spelling of 51808212 in words is "fifty-one million, eight hundred eight thousand, two hundred twelve".