638421355484 has 24 divisors (see below), whose sum is σ = 1218849288048. Its totient is φ = 290180839040.

The previous prime is 638421355457. The next prime is 638421355513. The reversal of 638421355484 is 484553124836.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1009862 + ... + 1515474.

It is an arithmetic number, because the mean of its divisors is an integer number (50785387002).

Almost surely, 2^638421355484 is an apocalyptic number.

It is an amenable number.

638421355484 is a deficient number, since it is larger than the sum of its proper divisors (580427932564).

638421355484 is a wasteful number, since it uses less digits than its factorization.

638421355484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534325 (or 534323 counting only the distinct ones).

The product of its digits is 11059200, while the sum is 53.

The spelling of 638421355484 in words is "six hundred thirty-eight billion, four hundred twenty-one million, three hundred fifty-five thousand, four hundred eighty-four".