51489768 has 128 divisors (see below), whose sum is σ = 148055040. Its totient is φ = 14784000.

The previous prime is 51489743. The next prime is 51489773. The reversal of 51489768 is 86798415.

51489768 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 31 ways as a sum of consecutive naturals, for example, 725173 + ... + 725243.

It is an arithmetic number, because the mean of its divisors is an integer number (1156680).

Almost surely, 2^51489768 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 51489768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74027520).

51489768 is an abundant number, since it is smaller than the sum of its proper divisors (96565272).

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

51489768 is a wasteful number, since it uses less digits than its factorization.

51489768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199 (or 195 counting only the distinct ones).

The product of its digits is 483840, while the sum is 48.

The square root of 51489768 is about 7175.6371145704. The cubic root of 51489768 is about 372.0263017592.

The spelling of 51489768 in words is "fifty-one million, four hundred eighty-nine thousand, seven hundred sixty-eight".