18894477888 has 336 divisors, whose sum is σ = 64012096512. Its totient is φ = 5253120000.

The previous prime is 18894477887. The next prime is 18894477893. The reversal of 18894477888 is 88877449881.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (18894477883) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15731688 + ... + 15732888.

It is an arithmetic number, because the mean of its divisors is an integer number (190512192).

Almost surely, 2^18894477888 is an apocalyptic number.

18894477888 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 18894477888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32006048256).

18894477888 is an abundant number, since it is smaller than the sum of its proper divisors (45117618624).

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

18894477888 is a wasteful number, since it uses less digits than its factorization.

18894477888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1434 (or 1421 counting only the distinct ones).

The product of its digits is 231211008, while the sum is 72.

The spelling of 18894477888 in words is "eighteen billion, eight hundred ninety-four million, four hundred seventy-seven thousand, eight hundred eighty-eight".