639646227 has 48 divisors (see below), whose sum is σ = 1056461952. Its totient is φ = 383512320.

The previous prime is 639646213. The next prime is 639646247. The reversal of 639646227 is 722646936.

639646227 is a `hidden beast` number, since 639 + 6 + 4 + 6 + 2 + 2 + 7 = 666.

It is not a de Polignac number, because 639646227 - 2⁴ = 639646211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639646247) 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 47 ways as a sum of consecutive naturals, for example, 258048 + ... + 260514.

It is an arithmetic number, because the mean of its divisors is an integer number (22009624).

Almost surely, 2^639646227 is an apocalyptic number.

639646227 is a deficient number, since it is larger than the sum of its proper divisors (416815725).

639646227 is a wasteful number, since it uses less digits than its factorization.

639646227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2590 (or 2578 counting only the distinct ones).

The product of its digits is 653184, while the sum is 45.

The square root of 639646227 is about 25291.2282619884. The cubic root of 639646227 is about 861.6150590745.

The spelling of 639646227 in words is "six hundred thirty-nine million, six hundred forty-six thousand, two hundred twenty-seven".