638624223 has 8 divisors (see below), whose sum is σ = 946110000. Its totient is φ = 425749464.

The previous prime is 638624171. The next prime is 638624243. The reversal of 638624223 is 322426836.

638624223 is a `hidden beast` number, since 6 + 3 + 8 + 624 + 2 + 23 = 666.

It is not a de Polignac number, because 638624223 - 2¹⁷ = 638493151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638624243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11826348 + ... + 11826401.

It is an arithmetic number, because the mean of its divisors is an integer number (118263750).

Almost surely, 2^638624223 is an apocalyptic number.

638624223 is a deficient number, since it is larger than the sum of its proper divisors (307485777).

638624223 is a wasteful number, since it uses less digits than its factorization.

638624223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23652758 (or 23652752 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The square root of 638624223 is about 25271.0154722757. The cubic root of 638624223 is about 861.1559284907.

The spelling of 638624223 in words is "six hundred thirty-eight million, six hundred twenty-four thousand, two hundred twenty-three".