638428602 has 32 divisors (see below), whose sum is σ = 1461485952. Its totient is φ = 182130624.

The previous prime is 638428577. The next prime is 638428603. The reversal of 638428602 is 206824836.

638428602 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (638428603) 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, 17208 + ... + 39660.

It is an arithmetic number, because the mean of its divisors is an integer number (45671436).

Almost surely, 2^638428602 is an apocalyptic number.

638428602 is an abundant number, since it is smaller than the sum of its proper divisors (823057350).

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

638428602 is a wasteful number, since it uses less digits than its factorization.

638428602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23142.

The product of its (nonzero) digits is 110592, while the sum is 39.

The square root of 638428602 is about 25267.1447140353. The cubic root of 638428602 is about 861.0679908160.

The spelling of 638428602 in words is "six hundred thirty-eight million, four hundred twenty-eight thousand, six hundred two".