18981428544 has 280 divisors, whose sum is σ = 61464066048. Its totient is φ = 5756728320.

The previous prime is 18981428539. The next prime is 18981428549. The reversal of 18981428544 is 44582418981.

18981428544 is a `hidden beast` number, since 1 + 8 + 98 + 1 + 4 + 2 + 8 + 544 = 666.

It is an interprime number because it is at equal distance from previous prime (18981428539) and next prime (18981428549).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18981428549) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4782849 + ... + 4786815.

Almost surely, 2^18981428544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18981428544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30732033024).

18981428544 is an abundant number, since it is smaller than the sum of its proper divisors (42482637504).

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

18981428544 is a wasteful number, since it uses less digits than its factorization.

18981428544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4075 (or 4056 counting only the distinct ones).

The product of its digits is 2949120, while the sum is 54.

The spelling of 18981428544 in words is "eighteen billion, nine hundred eighty-one million, four hundred twenty-eight thousand, five hundred forty-four".