51820686 has 24 divisors (see below), whose sum is σ = 112651344. Its totient is φ = 17216160.

The previous prime is 51820669. The next prime is 51820687. The reversal of 51820686 is 68602815.

It is a happy number.

51820686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 51820686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51820687) 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, 970 + ... + 10226.

It is an arithmetic number, because the mean of its divisors is an integer number (4693806).

Almost surely, 2^51820686 is an apocalyptic number.

51820686 is an abundant number, since it is smaller than the sum of its proper divisors (60830658).

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

51820686 is a wasteful number, since it uses less digits than its factorization.

51820686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9576 (or 9573 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 51820686 is about 7198.6586250495. The cubic root of 51820686 is about 372.8215885669.

The spelling of 51820686 in words is "fifty-one million, eight hundred twenty thousand, six hundred eighty-six".