18838578285 has 48 divisors (see below), whose sum is σ = 32787673776. Its totient is φ = 10006078464.

The previous prime is 18838578257. The next prime is 18838578287. The reversal of 18838578285 is 58287583881.

18838578285 is a `hidden beast` number, since 1 + 8 + 8 + 38 + 578 + 28 + 5 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 321628356 + 18516949929 = 17934^2 + 136077^2 .

It is not a de Polignac number, because 18838578285 - 2⁸ = 18838578029 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18838578287) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 21480267 + ... + 21481143.

It is an arithmetic number, because the mean of its divisors is an integer number (683076537).

Almost surely, 2^18838578285 is an apocalyptic number.

18838578285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18838578285 is a deficient number, since it is larger than the sum of its proper divisors (13949095491).

18838578285 is a wasteful number, since it uses less digits than its factorization.

18838578285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2302 (or 2299 counting only the distinct ones).

The product of its digits is 34406400, while the sum is 63.

The spelling of 18838578285 in words is "eighteen billion, eight hundred thirty-eight million, five hundred seventy-eight thousand, two hundred eighty-five".