51983920 has 20 divisors (see below), whose sum is σ = 120862800. Its totient is φ = 20793536.

The previous prime is 51983903. The next prime is 51983923. The reversal of 51983920 is 2938915.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 51983920.

It is not an unprimeable number, because it can be changed into a prime (51983923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324820 + ... + 324979.

It is an arithmetic number, because the mean of its divisors is an integer number (6043140).

Almost surely, 2^51983920 is an apocalyptic number.

It is an amenable number.

51983920 is an abundant number, since it is smaller than the sum of its proper divisors (68878880).

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

51983920 is a wasteful number, since it uses less digits than its factorization.

51983920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649812 (or 649806 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 51983920 is about 7209.9875173262. The cubic root of 51983920 is about 373.2126381388.

The spelling of 51983920 in words is "fifty-one million, nine hundred eighty-three thousand, nine hundred twenty".