53181856 has 72 divisors (see below), whose sum is σ = 131215140. Its totient is φ = 21030912.

The previous prime is 53181851. The next prime is 53181857. The reversal of 53181856 is 65818135.

It can be written as a sum of positive squares in 2 ways, for example, as 50979600 + 2202256 = 7140^2 + 1484^2 .

It is not an unprimeable number, because it can be changed into a prime (53181851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19080 + ... + 21688.

Almost surely, 2^53181856 is an apocalyptic number.

53181856 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53181856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65607570).

53181856 is an abundant number, since it is smaller than the sum of its proper divisors (78033284).

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

53181856 is a wasteful number, since it uses less digits than its factorization.

53181856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2646 (or 2631 counting only the distinct ones).

The product of its digits is 28800, while the sum is 37.

The square root of 53181856 is about 7292.5891149852. The cubic root of 53181856 is about 376.0577095667.

The spelling of 53181856 in words is "fifty-three million, one hundred eighty-one thousand, eight hundred fifty-six".