52171720 has 48 divisors (see below), whose sum is σ = 123924060. Its totient is φ = 19764864.

The previous prime is 52171709. The next prime is 52171733. The reversal of 52171720 is 2717125.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 42224004 + 9947716 = 6498^2 + 3154^2 .

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 11 ways as a sum of consecutive naturals, for example, 12634 + ... + 16246.

Almost surely, 2^52171720 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 52171720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61962030).

52171720 is an abundant number, since it is smaller than the sum of its proper divisors (71752340).

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

52171720 is a wasteful number, since it uses less digits than its factorization.

52171720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3662 (or 3639 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 52171720 is about 7222.9993769901. Note that the first 3 decimals coincide. The cubic root of 52171720 is about 373.6615275874.

Adding to 52171720 its reverse (2717125), we get a palindrome (54888845).

The spelling of 52171720 in words is "fifty-two million, one hundred seventy-one thousand, seven hundred twenty".