51289173728 has 24 divisors (see below), whose sum is σ = 108742912488. Its totient is φ = 23671926144.

The previous prime is 51289173707. The next prime is 51289173751. The reversal of 51289173728 is 82737198215.

51289173728 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 51289173728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61645226 + ... + 61646057.

It is an arithmetic number, because the mean of its divisors is an integer number (4530954687).

Almost surely, 2^51289173728 is an apocalyptic number.

It is an amenable number.

51289173728 is an abundant number, since it is smaller than the sum of its proper divisors (57453738760).

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

51289173728 is a wasteful number, since it uses less digits than its factorization.

51289173728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123291306 (or 123291298 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 53.

The spelling of 51289173728 in words is "fifty-one billion, two hundred eighty-nine million, one hundred seventy-three thousand, seven hundred twenty-eight".