51281502720 has 960 divisors, whose sum is σ = 204209786880. Its totient is φ = 10924720128.

The previous prime is 51281502707. The next prime is 51281502761. The reversal of 51281502720 is 2720518215.

It is a tau number, because it is divible by the number of its divisors (960).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 403791297 + ... + 403791423.

It is an arithmetic number, because the mean of its divisors is an integer number (212718528).

Almost surely, 2^51281502720 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 51281502720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102104893440).

51281502720 is an abundant number, since it is smaller than the sum of its proper divisors (152928284160).

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

51281502720 is a wasteful number, since it uses less digits than its factorization.

51281502720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 33.

The spelling of 51281502720 in words is "fifty-one billion, two hundred eighty-one million, five hundred two thousand, seven hundred twenty".