51504531320 has 128 divisors (see below), whose sum is σ = 131054837760. Its totient is φ = 18051816960.

The previous prime is 51504531317. The next prime is 51504531341. The reversal of 51504531320 is 2313540515.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1727177 + ... + 1756743.

It is an arithmetic number, because the mean of its divisors is an integer number (1023865920).

Almost surely, 2^51504531320 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 51504531320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65527418880).

51504531320 is an abundant number, since it is smaller than the sum of its proper divisors (79550306440).

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

51504531320 is a wasteful number, since it uses less digits than its factorization.

51504531320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29733 (or 29729 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 29.

The spelling of 51504531320 in words is "fifty-one billion, five hundred four million, five hundred thirty-one thousand, three hundred twenty".