51280204220 has 144 divisors (see below), whose sum is σ = 126902492640. Its totient is φ = 17354244096.

The previous prime is 51280204193. The next prime is 51280204253. The reversal of 51280204220 is 2240208215.

It is a self number, because there is not a number n which added to its sum of digits gives 51280204220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25911191 + ... + 25913169.

It is an arithmetic number, because the mean of its divisors is an integer number (881267310).

Almost surely, 2^51280204220 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 51280204220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63451246320).

51280204220 is an abundant number, since it is smaller than the sum of its proper divisors (75622288420).

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

51280204220 is a wasteful number, since it uses less digits than its factorization.

51280204220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332 (or 2323 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The spelling of 51280204220 in words is "fifty-one billion, two hundred eighty million, two hundred four thousand, two hundred twenty".