18874538208 has 144 divisors (see below), whose sum is σ = 56086351776. Its totient is φ = 6009569280.

The previous prime is 18874538191. The next prime is 18874538227. The reversal of 18874538208 is 80283547881.

18874538208 is a `hidden beast` number, since 1 + 8 + 87 + 4 + 538 + 20 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6205168 + ... + 6208208.

It is an arithmetic number, because the mean of its divisors is an integer number (389488554).

Almost surely, 2^18874538208 is an apocalyptic number.

18874538208 is a gapful number since it is divisible by the number (18) 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 18874538208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28043175888).

18874538208 is an abundant number, since it is smaller than the sum of its proper divisors (37211813568).

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

18874538208 is a wasteful number, since it uses less digits than its factorization.

18874538208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4017 (or 4006 counting only the distinct ones).

The product of its (nonzero) digits is 3440640, while the sum is 54.

The spelling of 18874538208 in words is "eighteen billion, eight hundred seventy-four million, five hundred thirty-eight thousand, two hundred eight".