52815720 has 32 divisors (see below), whose sum is σ = 158447520. Its totient is φ = 14084160.

The previous prime is 52815703. The next prime is 52815727. The reversal of 52815720 is 2751825.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (52815727) 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, 219946 + ... + 220185.

It is an arithmetic number, because the mean of its divisors is an integer number (4951485).

Almost surely, 2^52815720 is an apocalyptic number.

It is an amenable number.

52815720 is an abundant number, since it is smaller than the sum of its proper divisors (105631800).

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

52815720 is a wasteful number, since it uses less digits than its factorization.

52815720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440145 (or 440141 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 52815720 is about 7267.4424662325. The cubic root of 52815720 is about 375.1927187195.

It can be divided in two parts, 52815 and 720, that added together give a palindrome (53535).

The spelling of 52815720 in words is "fifty-two million, eight hundred fifteen thousand, seven hundred twenty".