8438549899920 has 480 divisors, whose sum is σ = 31079215088640. Its totient is φ = 1887864975360.

The previous prime is 8438549899837. The next prime is 8438549899931. The reversal of 8438549899920 is 299989458348.

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 95 ways as a sum of consecutive naturals, for example, 262384801 + ... + 262416959.

It is an arithmetic number, because the mean of its divisors is an integer number (64748364768).

Almost surely, 2^{8438549899920} is an apocalyptic number.

8438549899920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8438549899920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15539607544320).

8438549899920 is an abundant number, since it is smaller than the sum of its proper divisors (22640665188720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8438549899920 is a wasteful number, since it uses less digits than its factorization.

8438549899920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32663 (or 32650 counting only the distinct ones).

The product of its (nonzero) digits is 1612431360, while the sum is 78.

The spelling of 8438549899920 in words is "eight trillion, four hundred thirty-eight billion, five hundred forty-nine million, eight hundred ninety-nine thousand, nine hundred twenty".