51286707648 has 252 divisors, whose sum is σ = 162168193824. Its totient is φ = 15485184000.

The previous prime is 51286707643. The next prime is 51286707671. The reversal of 51286707648 is 84670768215.

51286707648 is a `hidden beast` number, since 512 + 8 + 67 + 0 + 7 + 64 + 8 = 666.

51286707648 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 51286707594 and 51286707603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51286707643) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 21813673 + ... + 21816023.

Almost surely, 2^51286707648 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 51286707648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81084096912).

51286707648 is an abundant number, since it is smaller than the sum of its proper divisors (110881486176).

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

51286707648 is a wasteful number, since it uses less digits than its factorization.

51286707648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2704 (or 2680 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 54.

The spelling of 51286707648 in words is "fifty-one billion, two hundred eighty-six million, seven hundred seven thousand, six hundred forty-eight".