51183920 has 40 divisors (see below), whose sum is σ = 119523600. Its totient is φ = 20384000.

The previous prime is 51183919. The next prime is 51183931. The reversal of 51183920 is 2938115.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18806 + ... + 21354.

It is an arithmetic number, because the mean of its divisors is an integer number (2988090).

Almost surely, 2^51183920 is an apocalyptic number.

It is an amenable number.

51183920 is an abundant number, since it is smaller than the sum of its proper divisors (68339680).

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

51183920 is a wasteful number, since it uses less digits than its factorization.

51183920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2813 (or 2807 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 51183920 is about 7154.2938156047. The cubic root of 51183920 is about 371.2882293123.

The spelling of 51183920 in words is "fifty-one million, one hundred eighty-three thousand, nine hundred twenty".