52781144 has 32 divisors (see below), whose sum is σ = 107315040. Its totient is φ = 24192000.

The previous prime is 52781123. The next prime is 52781147. The reversal of 52781144 is 44118725.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 52781144.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52781147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14024 + ... + 17384.

It is an arithmetic number, because the mean of its divisors is an integer number (3353595).

Almost surely, 2^52781144 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 52781144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53657520).

52781144 is an abundant number, since it is smaller than the sum of its proper divisors (54533896).

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

52781144 is a wasteful number, since it uses less digits than its factorization.

52781144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3531 (or 3527 counting only the distinct ones).

The product of its digits is 8960, while the sum is 32.

The square root of 52781144 is about 7265.0632481762. The cubic root of 52781144 is about 375.1108270949.

Adding to 52781144 its reverse (44118725), we get a palindrome (96899869).

It can be divided in two parts, 52781 and 144, that added together give a palindrome (52925).

The spelling of 52781144 in words is "fifty-two million, seven hundred eighty-one thousand, one hundred forty-four".