53518340 has 48 divisors (see below), whose sum is σ = 118525680. Its totient is φ = 20267520.

The previous prime is 53518319. The next prime is 53518343. The reversal of 53518340 is 4381535.

It can be written as a sum of positive squares in 8 ways, for example, as 5299204 + 48219136 = 2302^2 + 6944^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (53518343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29870 + ... + 31610.

It is an arithmetic number, because the mean of its divisors is an integer number (2469285).

Almost surely, 2^53518340 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 53518340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59262840).

53518340 is an abundant number, since it is smaller than the sum of its proper divisors (65007340).

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

53518340 is a wasteful number, since it uses less digits than its factorization.

53518340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1832 (or 1830 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 53518340 is about 7315.6230083295. The cubic root of 53518340 is about 376.8491540974.

Adding to 53518340 its reverse (4381535), we get a palindrome (57899875).

The spelling of 53518340 in words is "fifty-three million, five hundred eighteen thousand, three hundred forty".