639624601 has 16 divisors (see below), whose sum is σ = 798738048. Its totient is φ = 497606400.

The previous prime is 639624599. The next prime is 639624611. The reversal of 639624601 is 106426936.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 639624601 - 2¹ = 639624599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639624611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43921 + ... + 56641.

It is an arithmetic number, because the mean of its divisors is an integer number (49921128).

Almost surely, 2^639624601 is an apocalyptic number.

It is an amenable number.

639624601 is a deficient number, since it is larger than the sum of its proper divisors (159113447).

639624601 is a wasteful number, since it uses less digits than its factorization.

639624601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13392.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 639624601 is about 25290.8007188385. The cubic root of 639624601 is about 861.6053487604.

The spelling of 639624601 in words is "six hundred thirty-nine million, six hundred twenty-four thousand, six hundred one".