51820012 has 36 divisors (see below), whose sum is σ = 100573200. Its totient is φ = 23313664.

The previous prime is 51820009. The next prime is 51820037. The reversal of 51820012 is 21002815.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25614 + ... + 27562.

It is an arithmetic number, because the mean of its divisors is an integer number (2793700).

Almost surely, 2^51820012 is an apocalyptic number.

It is an amenable number.

51820012 is a deficient number, since it is larger than the sum of its proper divisors (48753188).

51820012 is a wasteful number, since it uses less digits than its factorization.

51820012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2010 (or 1991 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 51820012 is about 7198.6118106202. The cubic root of 51820012 is about 372.8199722057.

Adding to 51820012 its reverse (21002815), we get a palindrome (72822827).

The spelling of 51820012 in words is "fifty-one million, eight hundred twenty thousand, twelve".