639332673 has 32 divisors (see below), whose sum is σ = 996096000. Its totient is φ = 357198336.

The previous prime is 639332671. The next prime is 639332699. The reversal of 639332673 is 376233936.

It is not a de Polignac number, because 639332673 - 2¹ = 639332671 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639332671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 245265 + ... + 247857.

It is an arithmetic number, because the mean of its divisors is an integer number (31128000).

Almost surely, 2^639332673 is an apocalyptic number.

It is an amenable number.

639332673 is a deficient number, since it is larger than the sum of its proper divisors (356763327).

639332673 is a wasteful number, since it uses less digits than its factorization.

639332673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2861.

The product of its digits is 367416, while the sum is 42.

The square root of 639332673 is about 25285.0286335610. The cubic root of 639332673 is about 861.4742484235.

The spelling of 639332673 in words is "six hundred thirty-nine million, three hundred thirty-two thousand, six hundred seventy-three".