52515240 has 128 divisors (see below), whose sum is σ = 171417600. Its totient is φ = 12821760.

The previous prime is 52515217. The next prime is 52515263. The reversal of 52515240 is 4251525.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (52515217) and next prime (52515263).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 52515240.

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, 70309 + ... + 71051.

It is an arithmetic number, because the mean of its divisors is an integer number (1339200).

Almost surely, 2^52515240 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 52515240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85708800).

52515240 is an abundant number, since it is smaller than the sum of its proper divisors (118902360).

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

52515240 is a wasteful number, since it uses less digits than its factorization.

52515240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807 (or 803 counting only the distinct ones).

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

The square root of 52515240 is about 7246.7399566978. The cubic root of 52515240 is about 374.4798477335.

Adding to 52515240 its reverse (4251525), we get a palindrome (56766765).

The spelling of 52515240 in words is "fifty-two million, five hundred fifteen thousand, two hundred forty".