51172560 has 200 divisors, whose sum is σ = 182298600. Its totient is φ = 13298688.

The previous prime is 51172553. The next prime is 51172573. The reversal of 51172560 is 6527115.

It can be written as a sum of positive squares in 4 ways, for example, as 2396304 + 48776256 = 1548^2 + 6984^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 343366 + ... + 343514.

It is an arithmetic number, because the mean of its divisors is an integer number (911493).

Almost surely, 2^51172560 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 51172560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91149300).

51172560 is an abundant number, since it is smaller than the sum of its proper divisors (131126040).

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

51172560 is a wasteful number, since it uses less digits than its factorization.

51172560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 51172560 is about 7153.4998427343. The cubic root of 51172560 is about 371.2607587944.

Adding to 51172560 its reverse (6527115), we get a palindrome (57699675).

The spelling of 51172560 in words is "fifty-one million, one hundred seventy-two thousand, five hundred sixty".