51004043320 has 128 divisors (see below), whose sum is σ = 121258944000. Its totient is φ = 19280701440.

The previous prime is 51004043291. The next prime is 51004043329. The reversal of 51004043320 is 2334040015.

It is a junction number, because it is equal to n+sod(n) for n = 51004043291 and 51004043300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51004043329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15048186 + ... + 15051574.

It is an arithmetic number, because the mean of its divisors is an integer number (947335500).

Almost surely, 2^51004043320 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 51004043320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60629472000).

51004043320 is an abundant number, since it is smaller than the sum of its proper divisors (70254900680).

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

51004043320 is a wasteful number, since it uses less digits than its factorization.

51004043320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3713 (or 3709 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

Adding to 51004043320 its reverse (2334040015), we get a palindrome (53338083335).

The spelling of 51004043320 in words is "fifty-one billion, four million, forty-three thousand, three hundred twenty".