53218620 has 360 divisors, whose sum is σ = 216859104. Its totient is φ = 10637568.

The previous prime is 53218603. The next prime is 53218643. The reversal of 53218620 is 2681235.

53218620 is a `hidden beast` number, since 5 + 32 + 1 + 8 + 620 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 2800971 + ... + 2800989.

Almost surely, 2^53218620 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 53218620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108429552).

53218620 is an abundant number, since it is smaller than the sum of its proper divisors (163640484).

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

53218620 is a wasteful number, since it uses less digits than its factorization.

53218620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79 (or 49 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 53218620 is about 7295.1093206339. The cubic root of 53218620 is about 376.1443443837.

Adding to 53218620 its reverse (2681235), we get a palindrome (55899855).

The spelling of 53218620 in words is "fifty-three million, two hundred eighteen thousand, six hundred twenty".