53218540 has 24 divisors (see below), whose sum is σ = 111962592. Its totient is φ = 21248640.

The previous prime is 53218507. The next prime is 53218541. The reversal of 53218540 is 4581235.

It is a junction number, because it is equal to n+sod(n) for n = 53218499 and 53218508.

It is not an unprimeable number, because it can be changed into a prime (53218541) 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, 10512 + ... + 14728.

It is an arithmetic number, because the mean of its divisors is an integer number (4665108).

Almost surely, 2^53218540 is an apocalyptic number.

It is an amenable number.

53218540 is an abundant number, since it is smaller than the sum of its proper divisors (58744052).

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

53218540 is a wasteful number, since it uses less digits than its factorization.

53218540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4857 (or 4855 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 53218540 is about 7295.1038375064. The cubic root of 53218540 is about 376.1441559060.

Adding to 53218540 its reverse (4581235), we get a palindrome (57799775).

It can be divided in two parts, 5321 and 8540, that added together give a triangular number (13861 = T₁₆₆).

The spelling of 53218540 in words is "fifty-three million, two hundred eighteen thousand, five hundred forty".