51005574720 has 336 divisors, whose sum is σ = 185958236160. Its totient is φ = 13160586240.

The previous prime is 51005574673. The next prime is 51005574731. The reversal of 51005574720 is 2747550015.

51005574720 is a `hidden beast` number, since 5 + 10 + 0 + 5 + 574 + 72 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 8299969 + ... + 8306111.

Almost surely, 2^51005574720 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 51005574720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92979118080).

51005574720 is an abundant number, since it is smaller than the sum of its proper divisors (134952661440).

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

51005574720 is a wasteful number, since it uses less digits than its factorization.

51005574720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6231 (or 6184 counting only the distinct ones).

The product of its (nonzero) digits is 49000, while the sum is 36.

The spelling of 51005574720 in words is "fifty-one billion, five million, five hundred seventy-four thousand, seven hundred twenty".