639705601 has 16 divisors (see below), whose sum is σ = 682110720. Its totient is φ = 598586560.

The previous prime is 639705593. The next prime is 639705629. The reversal of 639705601 is 106507936.

It is a cyclic number.

It is not a de Polignac number, because 639705601 - 2³ = 639705593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639705301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 619956 + ... + 620986.

It is an arithmetic number, because the mean of its divisors is an integer number (42631920).

Almost surely, 2^639705601 is an apocalyptic number.

It is an amenable number.

639705601 is a deficient number, since it is larger than the sum of its proper divisors (42405119).

639705601 is a wasteful number, since it uses less digits than its factorization.

639705601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 639705601 is about 25292.4020409292. The cubic root of 639705601 is about 861.6417175343.

The spelling of 639705601 in words is "six hundred thirty-nine million, seven hundred five thousand, six hundred one".