53440720 has 20 divisors (see below), whose sum is σ = 124249860. Its totient is φ = 21376256.

The previous prime is 53440693. The next prime is 53440729. The reversal of 53440720 is 2704435.

53440720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 20539024 + 32901696 = 4532^2 + 5736^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53440729) 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 3 ways as a sum of consecutive naturals, for example, 333925 + ... + 334084.

It is an arithmetic number, because the mean of its divisors is an integer number (6212493).

Almost surely, 2^53440720 is an apocalyptic number.

It is an amenable number.

53440720 is an abundant number, since it is smaller than the sum of its proper divisors (70809140).

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

53440720 is a wasteful number, since it uses less digits than its factorization.

53440720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668022 (or 668016 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 53440720 is about 7310.3159986419. The cubic root of 53440720 is about 376.6668789863. Note that the first 3 decimals are identical.

The spelling of 53440720 in words is "fifty-three million, four hundred forty thousand, seven hundred twenty".