51784830720 has 648 divisors, whose sum is σ = 209924114400. Its totient is φ = 11751505920.

The previous prime is 51784830689. The next prime is 51784830761. The reversal of 51784830720 is 2703848715.

51784830720 is a `hidden beast` number, since 517 + 84 + 8 + 30 + 7 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 112331290 + ... + 112331750.

Almost surely, 2^51784830720 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 51784830720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104962057200).

51784830720 is an abundant number, since it is smaller than the sum of its proper divisors (158139283680).

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

51784830720 is a wasteful number, since it uses less digits than its factorization.

51784830720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701 (or 677 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The spelling of 51784830720 in words is "fifty-one billion, seven hundred eighty-four million, eight hundred thirty thousand, seven hundred twenty".