51317280 has 192 divisors, whose sum is σ = 205390080. Its totient is φ = 11722752.

The previous prime is 51317251. The next prime is 51317291. The reversal of 51317280 is 8271315.

51317280 is a `hidden beast` number, since 513 + 1 + 72 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29392 + ... + 31088.

It is an arithmetic number, because the mean of its divisors is an integer number (1069740).

Almost surely, 2^51317280 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 51317280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102695040).

51317280 is an abundant number, since it is smaller than the sum of its proper divisors (154072800).

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

51317280 is a wasteful number, since it uses less digits than its factorization.

51317280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1728 (or 1714 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 51317280 is about 7163.6080294779. The cubic root of 51317280 is about 371.6104141998.

Adding to 51317280 its reverse (8271315), we get a palindrome (59588595).

The spelling of 51317280 in words is "fifty-one million, three hundred seventeen thousand, two hundred eighty".