638880234 has 16 divisors (see below), whose sum is σ = 1279944288. Its totient is φ = 212596112.

The previous prime is 638880233. The next prime is 638880239. The reversal of 638880234 is 432088836.

It is not an unprimeable number, because it can be changed into a prime (638880233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87177 + ... + 94220.

It is an arithmetic number, because the mean of its divisors is an integer number (79996518).

Almost surely, 2^638880234 is an apocalyptic number.

638880234 is an abundant number, since it is smaller than the sum of its proper divisors (641064054).

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

638880234 is a wasteful number, since it uses less digits than its factorization.

638880234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181989.

The product of its (nonzero) digits is 221184, while the sum is 42.

The square root of 638880234 is about 25276.0802736500. The cubic root of 638880234 is about 861.2709862085.

It can be divided in two parts, 6388802 and 34, that added together give a palindrome (6388836).

The spelling of 638880234 in words is "six hundred thirty-eight million, eight hundred eighty thousand, two hundred thirty-four".