52115440 has 40 divisors (see below), whose sum is σ = 130491648. Its totient is φ = 19242240.

The previous prime is 52115429. The next prime is 52115443. The reversal of 52115440 is 4451125.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52115443) 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, 24016 + ... + 26095.

Almost surely, 2^52115440 is an apocalyptic number.

It is an amenable number.

52115440 is an abundant number, since it is smaller than the sum of its proper divisors (78376208).

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

52115440 is a wasteful number, since it uses less digits than its factorization.

52115440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50137 (or 50131 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 52115440 is about 7219.1024372840. The cubic root of 52115440 is about 373.5271173667.

Adding to 52115440 its reverse (4451125), we get a palindrome (56566565).

The spelling of 52115440 in words is "fifty-two million, one hundred fifteen thousand, four hundred forty".