18348879640 has 128 divisors (see below), whose sum is σ = 51674112000. Its totient is φ = 5708625408.

The previous prime is 18348879629. The next prime is 18348879641. The reversal of 18348879640 is 4697884381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18348879641) 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 31 ways as a sum of consecutive naturals, for example, 172041 + ... + 257479.

It is an arithmetic number, because the mean of its divisors is an integer number (403704000).

Almost surely, 2^18348879640 is an apocalyptic number.

18348879640 is a gapful number since it is divisible by the number (10) 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 18348879640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25837056000).

18348879640 is an abundant number, since it is smaller than the sum of its proper divisors (33325232360).

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

18348879640 is a wasteful number, since it uses less digits than its factorization.

18348879640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85529 (or 85525 counting only the distinct ones).

The product of its (nonzero) digits is 9289728, while the sum is 58.

The spelling of 18348879640 in words is "eighteen billion, three hundred forty-eight million, eight hundred seventy-nine thousand, six hundred forty".