51338669928 has 256 divisors, whose sum is σ = 159753216000. Its totient is φ = 13467347712.

The previous prime is 51338669891. The next prime is 51338669939. The reversal of 51338669928 is 82996683315.

It is a super-2 number, since 2×51338669928² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 135458043 + ... + 135458421.

It is an arithmetic number, because the mean of its divisors is an integer number (624036000).

Almost surely, 2^51338669928 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 51338669928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79876608000).

51338669928 is an abundant number, since it is smaller than the sum of its proper divisors (108414546072).

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

51338669928 is a wasteful number, since it uses less digits than its factorization.

51338669928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801 (or 771 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 60.

The spelling of 51338669928 in words is "fifty-one billion, three hundred thirty-eight million, six hundred sixty-nine thousand, nine hundred twenty-eight".