53117856 has 216 divisors, whose sum is σ = 178555104. Its totient is φ = 15396480.

The previous prime is 53117851. The next prime is 53117881. The reversal of 53117856 is 65871135.

53117856 is a `hidden beast` number, since 531 + 1 + 78 + 56 = 666.

It is a tau number, because it is divible by the number of its divisors (216).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 53117856.

It is not an unprimeable number, because it can be changed into a prime (53117851) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2309461 + ... + 2309483.

It is an arithmetic number, because the mean of its divisors is an integer number (826644).

Almost surely, 2^53117856 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 53117856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89277552).

53117856 is an abundant number, since it is smaller than the sum of its proper divisors (125437248).

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

53117856 is an equidigital number, since it uses as much as digits as its factorization.

53117856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68 (or 39 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 53117856 is about 7288.1997777229. The cubic root of 53117856 is about 375.9067974814.

The spelling of 53117856 in words is "fifty-three million, one hundred seventeen thousand, eight hundred fifty-six".