639065697 has 8 divisors (see below), whose sum is σ = 852239520. Its totient is φ = 425967840.

The previous prime is 639065689. The next prime is 639065719. The reversal of 639065697 is 796560936.

639065697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 639065697 - 2³ = 639065689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639065677) 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, 4954 + ... + 36092.

It is an arithmetic number, because the mean of its divisors is an integer number (106529940).

Almost surely, 2^639065697 is an apocalyptic number.

It is an amenable number.

639065697 is a deficient number, since it is larger than the sum of its proper divisors (213173823).

639065697 is a wasteful number, since it uses less digits than its factorization.

639065697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37983.

The product of its (nonzero) digits is 1837080, while the sum is 51.

The square root of 639065697 is about 25279.7487527072. The cubic root of 639065697 is about 861.3543187010.

The spelling of 639065697 in words is "six hundred thirty-nine million, sixty-five thousand, six hundred ninety-seven".