638468000449 has 16 divisors (see below), whose sum is σ = 676668358080. Its totient is φ = 600738102720.

The previous prime is 638468000399. The next prime is 638468000477. The reversal of 638468000449 is 944000864836.

It is a happy number.

It is not a de Polignac number, because 638468000449 - 2¹¹ = 638467998401 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 638468000396 and 638468000405.

It is not an unprimeable number, because it can be changed into a prime (638468000549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1987887 + ... + 2286619.

It is an arithmetic number, because the mean of its divisors is an integer number (42291772380).

It is the magic constant of a 10849 × 10849 magic square.

Almost surely, 2^638468000449 is an apocalyptic number.

It is an amenable number.

638468000449 is a deficient number, since it is larger than the sum of its proper divisors (38200357631).

638468000449 is a wasteful number, since it uses less digits than its factorization.

638468000449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299520.

The product of its (nonzero) digits is 3981312, while the sum is 52.

The spelling of 638468000449 in words is "six hundred thirty-eight billion, four hundred sixty-eight million, four hundred forty-nine", and thus it is an aban number.