18078920640 has 336 divisors, whose sum is σ = 71829594720. Its totient is φ = 4124835840.

The previous prime is 18078920627. The next prime is 18078920669. The reversal of 18078920640 is 4602987081.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 521776 + ... + 555344.

Almost surely, 2^18078920640 is an apocalyptic number.

18078920640 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 18078920640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35914797360).

18078920640 is an abundant number, since it is smaller than the sum of its proper divisors (53750674080).

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

18078920640 is a wasteful number, since it uses less digits than its factorization.

18078920640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33620 (or 33607 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 18078920640 in words is "eighteen billion, seventy-eight million, nine hundred twenty thousand, six hundred forty".