51441931728 has 240 divisors, whose sum is σ = 166595247936. Its totient is φ = 14644776960.

The previous prime is 51441931703. The next prime is 51441931733. The reversal of 51441931728 is 82713914415.

51441931728 is a `hidden beast` number, since 51 + 441 + 93 + 1 + 72 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18390426 + ... + 18393222.

Almost surely, 2^51441931728 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 51441931728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83297623968).

51441931728 is an abundant number, since it is smaller than the sum of its proper divisors (115153316208).

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

51441931728 is a wasteful number, since it uses less digits than its factorization.

51441931728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3522 (or 3513 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The spelling of 51441931728 in words is "fifty-one billion, four hundred forty-one million, nine hundred thirty-one thousand, seven hundred twenty-eight".