53644385 has 4 divisors (see below), whose sum is σ = 64373268. Its totient is φ = 42915504.

The previous prime is 53644379. The next prime is 53644387. The reversal of 53644385 is 58344635.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41589601 + 12054784 = 6449^2 + 3472^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53644385 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53644387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5364434 + ... + 5364443.

It is an arithmetic number, because the mean of its divisors is an integer number (16093317).

Almost surely, 2^53644385 is an apocalyptic number.

It is an amenable number.

53644385 is a deficient number, since it is larger than the sum of its proper divisors (10728883).

53644385 is a wasteful number, since it uses less digits than its factorization.

53644385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10728882.

The product of its digits is 172800, while the sum is 38.

The square root of 53644385 is about 7324.2327243200. The cubic root of 53644385 is about 377.1447705790.

The spelling of 53644385 in words is "fifty-three million, six hundred forty-four thousand, three hundred eighty-five".