639106671 has 8 divisors (see below), whose sum is σ = 973876864. Its totient is φ = 365203800.

The previous prime is 639106579. The next prime is 639106673. The reversal of 639106671 is 176601936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 639106671 - 2¹¹ = 639104623 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 (639106673) 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, 15216805 + ... + 15216846.

It is an arithmetic number, because the mean of its divisors is an integer number (121734608).

Almost surely, 2^639106671 is an apocalyptic number.

639106671 is a deficient number, since it is larger than the sum of its proper divisors (334770193).

639106671 is a wasteful number, since it uses less digits than its factorization.

639106671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30433661.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 639106671 is about 25280.5591512530. The cubic root of 639106671 is about 861.3727270210.

The spelling of 639106671 in words is "six hundred thirty-nine million, one hundred six thousand, six hundred seventy-one".