52540240 has 20 divisors (see below), whose sum is σ = 122156244. Its totient is φ = 21016064.

The previous prime is 52540237. The next prime is 52540247. The reversal of 52540240 is 4204525.

It can be written as a sum of positive squares in 2 ways, for example, as 10394176 + 42146064 = 3224^2 + 6492^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52540247) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 328297 + ... + 328456.

Almost surely, 2^52540240 is an apocalyptic number.

It is an amenable number.

52540240 is an abundant number, since it is smaller than the sum of its proper divisors (69616004).

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

52540240 is a wasteful number, since it uses less digits than its factorization.

52540240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656766 (or 656760 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 52540240 is about 7248.4646650170. The cubic root of 52540240 is about 374.5392623020.

Adding to 52540240 its reverse (4204525), we get a palindrome (56744765).

The spelling of 52540240 in words is "fifty-two million, five hundred forty thousand, two hundred forty".