638484236 has 12 divisors (see below), whose sum is σ = 1203297312. Its totient is φ = 294685008.

The previous prime is 638484233. The next prime is 638484251. The reversal of 638484236 is 632484836.

638484236 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 (638484233) 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, 6139220 + ... + 6139323.

It is an arithmetic number, because the mean of its divisors is an integer number (100274776).

Almost surely, 2^638484236 is an apocalyptic number.

It is an amenable number.

638484236 is a deficient number, since it is larger than the sum of its proper divisors (564813076).

638484236 is a wasteful number, since it uses less digits than its factorization.

638484236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12278560 (or 12278558 counting only the distinct ones).

The product of its digits is 663552, while the sum is 44.

The square root of 638484236 is about 25268.2456058983. The cubic root of 638484236 is about 861.0930018431.

The spelling of 638484236 in words is "six hundred thirty-eight million, four hundred eighty-four thousand, two hundred thirty-six".