639696498 has 16 divisors (see below), whose sum is σ = 1462163520. Its totient is φ = 182770416.

The previous prime is 639696481. The next prime is 639696517. The reversal of 639696498 is 894696936.

It is a happy number.

639696498 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7615393 + ... + 7615476.

It is an arithmetic number, because the mean of its divisors is an integer number (91385220).

Almost surely, 2^639696498 is an apocalyptic number.

639696498 is an abundant number, since it is smaller than the sum of its proper divisors (822467022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639696498 is a wasteful number, since it uses less digits than its factorization.

639696498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15230881.

The product of its digits is 15116544, while the sum is 60.

The square root of 639696498 is about 25292.2220850601. Note that the first 3 decimals coincide. The cubic root of 639696498 is about 861.6376304658.

The spelling of 639696498 in words is "six hundred thirty-nine million, six hundred ninety-six thousand, four hundred ninety-eight".