639664301 has 8 divisors (see below), whose sum is σ = 645855000. Its totient is φ = 633499200.

The previous prime is 639664283. The next prime is 639664349. The reversal of 639664301 is 103466936.

It can be written as a sum of positive squares in 4 ways, for example, as 30858025 + 608806276 = 5555^2 + 24674^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 639664301 - 2²² = 635469997 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 (639664391) 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, 45851 + ... + 58151.

It is an arithmetic number, because the mean of its divisors is an integer number (80731875).

Almost surely, 2^639664301 is an apocalyptic number.

It is an amenable number.

639664301 is a deficient number, since it is larger than the sum of its proper divisors (6190699).

639664301 is a wasteful number, since it uses less digits than its factorization.

639664301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12799.

The product of its (nonzero) digits is 69984, while the sum is 38.

The square root of 639664301 is about 25291.5855770254. The cubic root of 639664301 is about 861.6231743332.

The spelling of 639664301 in words is "six hundred thirty-nine million, six hundred sixty-four thousand, three hundred one".