639196677 has 64 divisors (see below), whose sum is σ = 1122232320. Its totient is φ = 356393520.

The previous prime is 639196673. The next prime is 639196697. The reversal of 639196677 is 776691936.

It is not a de Polignac number, because 639196677 - 2² = 639196673 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639196673) 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 63 ways as a sum of consecutive naturals, for example, 657802 + ... + 658772.

It is an arithmetic number, because the mean of its divisors is an integer number (17534880).

Almost surely, 2^639196677 is an apocalyptic number.

It is an amenable number.

639196677 is a deficient number, since it is larger than the sum of its proper divisors (483035643).

639196677 is an frugal number, since it uses more digits than its factorization.

639196677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042 (or 1024 counting only the distinct ones).

The product of its digits is 2571912, while the sum is 54.

The square root of 639196677 is about 25282.3392311708. The cubic root of 639196677 is about 861.4131611029.

The spelling of 639196677 in words is "six hundred thirty-nine million, one hundred ninety-six thousand, six hundred seventy-seven".