51786774720 has 672 divisors, whose sum is σ = 192682953216. Its totient is φ = 12740198400.

The previous prime is 51786774701. The next prime is 51786774733. The reversal of 51786774720 is 2747768715.

51786774720 is a `hidden beast` number, since 517 + 8 + 67 + 7 + 47 + 20 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 201504832 + ... + 201505088.

Almost surely, 2^51786774720 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 51786774720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96341476608).

51786774720 is an abundant number, since it is smaller than the sum of its proper divisors (140896178496).

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

51786774720 is a wasteful number, since it uses less digits than its factorization.

51786774720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 4609920, while the sum is 54.

The spelling of 51786774720 in words is "fifty-one billion, seven hundred eighty-six million, seven hundred seventy-four thousand, seven hundred twenty".