53213440 has 72 divisors (see below), whose sum is σ = 145696320. Its totient is φ = 18241536.

The previous prime is 53213429. The next prime is 53213497. The reversal of 53213440 is 4431235.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5991 + ... + 11929.

It is an arithmetic number, because the mean of its divisors is an integer number (2023560).

Almost surely, 2^53213440 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 53213440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72848160).

53213440 is an abundant number, since it is smaller than the sum of its proper divisors (92482880).

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

53213440 is an equidigital number, since it uses as much as digits as its factorization.

53213440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5967 (or 5953 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 53213440 is about 7294.7542796176. The cubic root of 53213440 is about 376.1321400655.

Adding to 53213440 its reverse (4431235), we get a palindrome (57644675).

The spelling of 53213440 in words is "fifty-three million, two hundred thirteen thousand, four hundred forty".