52115540 has 24 divisors (see below), whose sum is σ = 115881192. Its totient is φ = 19619840.

The previous prime is 52115521. The next prime is 52115549. The reversal of 52115540 is 4551125.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 27394756 + 24720784 = 5234^2 + 4972^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52115549) 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, 76301 + ... + 76980.

It is an arithmetic number, because the mean of its divisors is an integer number (4828383).

Almost surely, 2^52115540 is an apocalyptic number.

It is an amenable number.

52115540 is an abundant number, since it is smaller than the sum of its proper divisors (63765652).

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

52115540 is a wasteful number, since it uses less digits than its factorization.

52115540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153307 (or 153305 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 52115540 is about 7219.1093633495. The cubic root of 52115540 is about 373.5273562767.

Adding to 52115540 its reverse (4551125), we get a palindrome (56666665).

It can be divided in two parts, 521 and 15540, that added together give a palindrome (16061).

The spelling of 52115540 in words is "fifty-two million, one hundred fifteen thousand, five hundred forty".