51047904 has 96 divisors (see below), whose sum is σ = 139345920. Its totient is φ = 16353792.

The previous prime is 51047891. The next prime is 51047929. The reversal of 51047904 is 40974015.

It is a happy number.

51047904 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

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, 401889 + ... + 402015.

It is an arithmetic number, because the mean of its divisors is an integer number (1451520).

Almost surely, 2^51047904 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 51047904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69672960).

51047904 is an abundant number, since it is smaller than the sum of its proper divisors (88298016).

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

51047904 is a wasteful number, since it uses less digits than its factorization.

51047904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 51047904 is about 7144.7815921832. The cubic root of 51047904 is about 370.9590508006.

The spelling of 51047904 in words is "fifty-one million, forty-seven thousand, nine hundred four".