55644223 has 4 divisors (see below), whose sum is σ = 56694168. Its totient is φ = 54594280.

The previous prime is 55644209. The next prime is 55644227. The reversal of 55644223 is 32244655.

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 55644223 - 2⁹ = 55643711 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 (55644227) 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, 524893 + ... + 524998.

It is an arithmetic number, because the mean of its divisors is an integer number (14173542).

Almost surely, 2^55644223 is an apocalyptic number.

55644223 is a gapful number since it is divisible by the number (53) formed by its first and last digit.

55644223 is a deficient number, since it is larger than the sum of its proper divisors (1049945).

55644223 is a wasteful number, since it uses less digits than its factorization.

55644223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049944.

The product of its digits is 28800, while the sum is 31.

The square root of 55644223 is about 7459.5055466163. The cubic root of 55644223 is about 381.7743040573.

Adding to 55644223 its reverse (32244655), we get a palindrome (87888878).

The spelling of 55644223 in words is "fifty-five million, six hundred forty-four thousand, two hundred twenty-three".