53505040 has 20 divisors (see below), whose sum is σ = 124399404. Its totient is φ = 21401984.

The previous prime is 53505017. The next prime is 53505073. The reversal of 53505040 is 4050535.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 23386896 + 30118144 = 4836^2 + 5488^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 334327 + ... + 334486.

Almost surely, 2^53505040 is an apocalyptic number.

It is an amenable number.

53505040 is an abundant number, since it is smaller than the sum of its proper divisors (70894364).

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

53505040 is a wasteful number, since it uses less digits than its factorization.

53505040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668826 (or 668820 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 22.

The square root of 53505040 is about 7314.7139383574. The cubic root of 53505040 is about 376.8179342140.

Adding to 53505040 its reverse (4050535), we get a palindrome (57555575).

The spelling of 53505040 in words is "fifty-three million, five hundred five thousand, forty".