18078439632 has 360 divisors, whose sum is σ = 55025228160. Its totient is φ = 5106816000.

The previous prime is 18078439627. The next prime is 18078439651. The reversal of 18078439632 is 23693487081.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 228840969 + ... + 228841047.

It is an arithmetic number, because the mean of its divisors is an integer number (152847856).

Almost surely, 2^18078439632 is an apocalyptic number.

18078439632 is a gapful number since it is divisible by the number (12) 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 18078439632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27512614080).

18078439632 is an abundant number, since it is smaller than the sum of its proper divisors (36946788528).

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

18078439632 is a wasteful number, since it uses less digits than its factorization.

18078439632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 51.

The spelling of 18078439632 in words is "eighteen billion, seventy-eight million, four hundred thirty-nine thousand, six hundred thirty-two".