18336878240 has 24 divisors (see below), whose sum is σ = 43320875220. Its totient is φ = 7334751232.

The previous prime is 18336878233. The next prime is 18336878243. The reversal of 18336878240 is 4287863381.

It can be written as a sum of positive squares in 2 ways, for example, as 16596653584 + 1740224656 = 128828^2 + 41716^2 .

It is a super-2 number, since 2×18336878240² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18336878243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57302585 + ... + 57302904.

Almost surely, 2^18336878240 is an apocalyptic number.

18336878240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18336878240 is an abundant number, since it is smaller than the sum of its proper divisors (24983996980).

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

18336878240 is a wasteful number, since it uses less digits than its factorization.

18336878240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114605504 (or 114605496 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 50.

The spelling of 18336878240 in words is "eighteen billion, three hundred thirty-six million, eight hundred seventy-eight thousand, two hundred forty".