51866920 has 64 divisors (see below), whose sum is σ = 135302400. Its totient is φ = 17525760.

The previous prime is 51866869. The next prime is 51866921. The reversal of 51866920 is 2966815.

51866920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 51866920.

It is not an unprimeable number, because it can be changed into a prime (51866921) 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 15 ways as a sum of consecutive naturals, for example, 18576 + ... + 21184.

It is an arithmetic number, because the mean of its divisors is an integer number (2114100).

Almost surely, 2^51866920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51866920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67651200).

51866920 is an abundant number, since it is smaller than the sum of its proper divisors (83435480).

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

51866920 is a wasteful number, since it uses less digits than its factorization.

51866920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2698 (or 2694 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 51866920 is about 7201.8692018114. The cubic root of 51866920 is about 372.9324317517.

The spelling of 51866920 in words is "fifty-one million, eight hundred sixty-six thousand, nine hundred twenty".