52215540 has 48 divisors (see below), whose sum is σ = 157452288. Its totient is φ = 12852864.

The previous prime is 52215529. The next prime is 52215607. The reversal of 52215540 is 4551225.

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 52215540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32692 + ... + 34251.

It is an arithmetic number, because the mean of its divisors is an integer number (3280256).

Almost surely, 2^52215540 is an apocalyptic number.

It is an amenable number.

52215540 is an abundant number, since it is smaller than the sum of its proper divisors (105236748).

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

52215540 is a wasteful number, since it uses less digits than its factorization.

52215540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66968 (or 66966 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 52215540 is about 7226.0321062115. The cubic root of 52215540 is about 373.7661134054.

Adding to 52215540 its reverse (4551225), we get a palindrome (56766765).

It can be divided in two parts, 52215 and 540, that multiplied together give a square (28196100 = 5310²).

The spelling of 52215540 in words is "fifty-two million, two hundred fifteen thousand, five hundred forty".