18390446880 has 192 divisors, whose sum is σ = 62480315520. Its totient is φ = 4520042496.

The previous prime is 18390446869. The next prime is 18390446887. The reversal of 18390446880 is 8864409381.

It is a super-2 number, since 2×18390446880² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18390446887) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5046339 + ... + 5049981.

It is an arithmetic number, because the mean of its divisors is an integer number (325418310).

Almost surely, 2^18390446880 is an apocalyptic number.

18390446880 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 18390446880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31240157760).

18390446880 is an abundant number, since it is smaller than the sum of its proper divisors (44089868640).

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

18390446880 is a wasteful number, since it uses less digits than its factorization.

18390446880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4483 (or 4475 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 51.

The spelling of 18390446880 in words is "eighteen billion, three hundred ninety million, four hundred forty-six thousand, eight hundred eighty".