639420330 has 16 divisors (see below), whose sum is σ = 1534608864. Its totient is φ = 170512080.

The previous prime is 639420307. The next prime is 639420373. The reversal of 639420330 is 33024936.

639420330 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 21314011 = 639420330 / (6 + 3 + 9 + 4 + 2 + 0 + 3 + 3 + 0).

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, 10656976 + ... + 10657035.

It is an arithmetic number, because the mean of its divisors is an integer number (95913054).

Almost surely, 2^639420330 is an apocalyptic number.

639420330 is an abundant number, since it is smaller than the sum of its proper divisors (895188534).

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

639420330 is a wasteful number, since it uses less digits than its factorization.

639420330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21314021.

The product of its (nonzero) digits is 11664, while the sum is 30.

The square root of 639420330 is about 25286.7619516616. The cubic root of 639420330 is about 861.5136180144.

The spelling of 639420330 in words is "six hundred thirty-nine million, four hundred twenty thousand, three hundred thirty".