639670701 has 12 divisors (see below), whose sum is σ = 900147552. Its totient is φ = 404001864.

The previous prime is 639670699. The next prime is 639670721. The reversal of 639670701 is 107076936.

It is not a de Polignac number, because 639670701 - 2¹ = 639670699 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 639670701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639670721) 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 11 ways as a sum of consecutive naturals, for example, 294241 + ... + 296406.

It is an arithmetic number, because the mean of its divisors is an integer number (75012296).

Almost surely, 2^639670701 is an apocalyptic number.

It is an amenable number.

639670701 is a deficient number, since it is larger than the sum of its proper divisors (260476851).

639670701 is a wasteful number, since it uses less digits than its factorization.

639670701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590688 (or 590669 counting only the distinct ones).

The product of its (nonzero) digits is 47628, while the sum is 39.

The square root of 639670701 is about 25291.7121010026. The cubic root of 639670701 is about 861.6260479082.

The spelling of 639670701 in words is "six hundred thirty-nine million, six hundred seventy thousand, seven hundred one".