18728307285 has 32 divisors (see below), whose sum is σ = 30431479680. Its totient is φ = 9834144000.

The previous prime is 18728307253. The next prime is 18728307289. The reversal of 18728307285 is 58270382781.

It is not a de Polignac number, because 18728307285 - 2⁵ = 18728307253 is a prime.

It is a super-2 number, since 2×18728307285² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18728307289) 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, 236655 + ... + 305715.

It is an arithmetic number, because the mean of its divisors is an integer number (950983740).

Almost surely, 2^18728307285 is an apocalyptic number.

18728307285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18728307285 is a deficient number, since it is larger than the sum of its proper divisors (11703172395).

18728307285 is a wasteful number, since it uses less digits than its factorization.

18728307285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69349.

The product of its (nonzero) digits is 1505280, while the sum is 51.

The spelling of 18728307285 in words is "eighteen billion, seven hundred twenty-eight million, three hundred seven thousand, two hundred eighty-five".