51986439360 has 224 divisors, whose sum is σ = 189721540800. Its totient is φ = 13384949760.

The previous prime is 51986439313. The next prime is 51986439377. The reversal of 51986439360 is 6393468915.

51986439360 is a `hidden beast` number, since 5 + 198 + 6 + 4 + 393 + 60 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 51986439297 and 51986439306.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146820 + ... + 354300.

Almost surely, 2^51986439360 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 51986439360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94860770400).

51986439360 is an abundant number, since it is smaller than the sum of its proper divisors (137735101440).

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

51986439360 is a wasteful number, since it uses less digits than its factorization.

51986439360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207536 (or 207520 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 54.

The spelling of 51986439360 in words is "fifty-one billion, nine hundred eighty-six million, four hundred thirty-nine thousand, three hundred sixty".