18319820448 has 48 divisors (see below), whose sum is σ = 49207900896. Its totient is φ = 5964591360.

The previous prime is 18319820447. The next prime is 18319820509. The reversal of 18319820448 is 84402891381.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 18319820397 and 18319820406.

It is not an unprimeable number, because it can be changed into a prime (18319820447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2214843 + ... + 2223098.

It is an arithmetic number, because the mean of its divisors is an integer number (1025164602).

Almost surely, 2^18319820448 is an apocalyptic number.

It is an amenable number.

18319820448 is an abundant number, since it is smaller than the sum of its proper divisors (30888080448).

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

18319820448 is a wasteful number, since it uses less digits than its factorization.

18319820448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4437997 (or 4437989 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 48.

The spelling of 18319820448 in words is "eighteen billion, three hundred nineteen million, eight hundred twenty thousand, four hundred forty-eight".