51438415320 has 288 divisors, whose sum is σ = 180417444480. Its totient is φ = 12695823360.

The previous prime is 51438415319. The next prime is 51438415337. The reversal of 51438415320 is 2351483415.

51438415320 is a `hidden beast` number, since 5 + 1 + 43 + 84 + 1 + 532 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 5899284 + ... + 5907996.

It is an arithmetic number, because the mean of its divisors is an integer number (626449460).

Almost surely, 2^51438415320 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 51438415320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90208722240).

51438415320 is an abundant number, since it is smaller than the sum of its proper divisors (128979029160).

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

51438415320 is a wasteful number, since it uses less digits than its factorization.

51438415320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8807 (or 8777 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

Adding to 51438415320 its reverse (2351483415), we get a palindrome (53789898735).

The spelling of 51438415320 in words is "fifty-one billion, four hundred thirty-eight million, four hundred fifteen thousand, three hundred twenty".