51238390320 has 800 divisors, whose sum is σ = 208620897408. Its totient is φ = 11537842176.

The previous prime is 51238390319. The next prime is 51238390349. The reversal of 51238390320 is 2309383215.

51238390320 is a `hidden beast` number, since 5 + 1 + 238 + 390 + 32 + 0 = 666.

51238390320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 52986477 + ... + 52987443.

Almost surely, 2^51238390320 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 51238390320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104310448704).

51238390320 is an abundant number, since it is smaller than the sum of its proper divisors (157382507088).

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

51238390320 is a wasteful number, since it uses less digits than its factorization.

51238390320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059 (or 1044 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The spelling of 51238390320 in words is "fifty-one billion, two hundred thirty-eight million, three hundred ninety thousand, three hundred twenty".