52215240 has 128 divisors (see below), whose sum is σ = 195333120. Its totient is φ = 10848000.

The previous prime is 52215239. The next prime is 52215269. The reversal of 52215240 is 4251225.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6415 + ... + 12065.

It is an arithmetic number, because the mean of its divisors is an integer number (1526040).

Almost surely, 2^52215240 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 52215240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97666560).

52215240 is an abundant number, since it is smaller than the sum of its proper divisors (143117880).

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

52215240 is a wasteful number, since it uses less digits than its factorization.

52215240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5683 (or 5679 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 52215240 is about 7226.0113479014. The cubic root of 52215240 is about 373.7653975901.

Adding to 52215240 its reverse (4251225), we get a palindrome (56466465).

It can be divided in two parts, 52215 and 240, that multiplied together give a square (12531600 = 3540²).

The spelling of 52215240 in words is "fifty-two million, two hundred fifteen thousand, two hundred forty".