18985728333 has 32 divisors (see below), whose sum is σ = 31489299072. Its totient is φ = 9996595200.

The previous prime is 18985728331. The next prime is 18985728353. The reversal of 18985728333 is 33382758981.

It is a happy number.

It is not a de Polignac number, because 18985728333 - 2¹ = 18985728331 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18985728331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1294348 + ... + 1308933.

It is an arithmetic number, because the mean of its divisors is an integer number (984040596).

Almost surely, 2^18985728333 is an apocalyptic number.

18985728333 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18985728333 is a deficient number, since it is larger than the sum of its proper divisors (12503570739).

18985728333 is a wasteful number, since it uses less digits than its factorization.

18985728333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2603325.

The product of its digits is 8709120, while the sum is 57.

The spelling of 18985728333 in words is "eighteen billion, nine hundred eighty-five million, seven hundred twenty-eight thousand, three hundred thirty-three".