638220744866884 has 24 divisors (see below), whose sum is σ = 1118188590317568. Its totient is φ = 318738394725600.

The previous prime is 638220744866867. The next prime is 638220744866917. The reversal of 638220744866884 is 488668447022836.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 638220744866884.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11472459 + ... + 37524109.

It is an arithmetic number, because the mean of its divisors is an integer number (46591191263232).

Almost surely, 2^{638220744866884} is an apocalyptic number.

It is an amenable number.

638220744866884 is a deficient number, since it is larger than the sum of its proper divisors (479967845450684).

638220744866884 is a wasteful number, since it uses less digits than its factorization.

638220744866884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26058795 (or 26058793 counting only the distinct ones).

The product of its (nonzero) digits is 4756340736, while the sum is 76.

The spelling of 638220744866884 in words is "six hundred thirty-eight trillion, two hundred twenty billion, seven hundred forty-four million, eight hundred sixty-six thousand, eight hundred eighty-four".