638495356 has 6 divisors (see below), whose sum is σ = 1117366880. Its totient is φ = 319247676.

The previous prime is 638495353. The next prime is 638495369. The reversal of 638495356 is 653594836.

It is a happy number.

638495356 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638495353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79811916 + ... + 79811923.

Almost surely, 2^638495356 is an apocalyptic number.

It is an amenable number.

638495356 is a deficient number, since it is larger than the sum of its proper divisors (478871524).

638495356 is a wasteful number, since it uses less digits than its factorization.

638495356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159623843 (or 159623841 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 49.

The square root of 638495356 is about 25268.4656439603. The cubic root of 638495356 is about 861.0980008172.

The spelling of 638495356 in words is "six hundred thirty-eight million, four hundred ninety-five thousand, three hundred fifty-six".