53323440 has 80 divisors (see below), whose sum is σ = 169179648. Its totient is φ = 13886208.

The previous prime is 53323423. The next prime is 53323447. The reversal of 53323440 is 4432335.

53323440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 53323440.

It is not an unprimeable number, because it can be changed into a prime (53323447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7737 + ... + 12903.

Almost surely, 2^53323440 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 53323440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84589824).

53323440 is an abundant number, since it is smaller than the sum of its proper divisors (115856208).

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

53323440 is a wasteful number, since it uses less digits than its factorization.

53323440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5226 (or 5220 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 24.

The square root of 53323440 is about 7302.2900517577. The cubic root of 53323440 is about 376.3911351553.

Adding to 53323440 its reverse (4432335), we get a palindrome (57755775).

The spelling of 53323440 in words is "fifty-three million, three hundred twenty-three thousand, four hundred forty".