18304857978 has 48 divisors (see below), whose sum is σ = 40307056608. Its totient is φ = 5537743200.

The previous prime is 18304857941. The next prime is 18304857997. The reversal of 18304857978 is 87975840381.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 424473 + ... + 465603.

It is an arithmetic number, because the mean of its divisors is an integer number (839730346).

Almost surely, 2^18304857978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18304857978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20153528304).

18304857978 is an abundant number, since it is smaller than the sum of its proper divisors (22002198630).

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

18304857978 is a wasteful number, since it uses less digits than its factorization.

18304857978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41771 (or 41760 counting only the distinct ones).

The product of its (nonzero) digits is 13547520, while the sum is 60.

The spelling of 18304857978 in words is "eighteen billion, three hundred four million, eight hundred fifty-seven thousand, nine hundred seventy-eight".