53320447 has 4 divisors (see below), whose sum is σ = 53337856. Its totient is φ = 53303040.

The previous prime is 53320439. The next prime is 53320453. The reversal of 53320447 is 74402335.

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

It is a cyclic number.

It is not a de Polignac number, because 53320447 - 2³ = 53320439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53320427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2754 + ... + 10687.

It is an arithmetic number, because the mean of its divisors is an integer number (13334464).

Almost surely, 2^53320447 is an apocalyptic number.

53320447 is a deficient number, since it is larger than the sum of its proper divisors (17409).

53320447 is a wasteful number, since it uses less digits than its factorization.

53320447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17408.

The product of its (nonzero) digits is 10080, while the sum is 28.

The square root of 53320447 is about 7302.0851131714. The cubic root of 53320447 is about 376.3840928506.

The spelling of 53320447 in words is "fifty-three million, three hundred twenty thousand, four hundred forty-seven".