53665440 has 96 divisors (see below), whose sum is σ = 176432256. Its totient is φ = 13685760.

The previous prime is 53665427. The next prime is 53665483. The reversal of 53665440 is 4456635.

53665440 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 (96).

It is an unprimeable number.

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, 8610 + ... + 13470.

It is an arithmetic number, because the mean of its divisors is an integer number (1837836).

Almost surely, 2^53665440 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 53665440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88216128).

53665440 is an abundant number, since it is smaller than the sum of its proper divisors (122766816).

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

53665440 is a wasteful number, since it uses less digits than its factorization.

53665440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4902 (or 4894 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 53665440 is about 7325.6699352346. The cubic root of 53665440 is about 377.1941062456.

The spelling of 53665440 in words is "fifty-three million, six hundred sixty-five thousand, four hundred forty".