639622002 has 8 divisors (see below), whose sum is σ = 1279244016. Its totient is φ = 213207332.

The previous prime is 639621949. The next prime is 639622007. The reversal of 639622002 is 200226936.

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

639622002 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (639622007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53301828 + ... + 53301839.

It is an arithmetic number, because the mean of its divisors is an integer number (159905502).

Almost surely, 2^639622002 is an apocalyptic number.

639622002 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

639622002 is a wasteful number, since it uses less digits than its factorization.

639622002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106603672.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 639622002 is about 25290.7493364669. The cubic root of 639622002 is about 861.6041817658.

Adding to 639622002 its reverse (200226936), we get a palindrome (839848938).

The spelling of 639622002 in words is "six hundred thirty-nine million, six hundred twenty-two thousand, two".