28505180203 has 8 divisors (see below), whose sum is σ = 29755313568. Its totient is φ = 27255945024.

The previous prime is 28505180201. The next prime is 28505180227. The reversal of 28505180203 is 30208150582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28505180203 - 2¹ = 28505180201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28505180201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159276 + ... + 287017.

It is an arithmetic number, because the mean of its divisors is an integer number (3719414196).

Almost surely, 2^28505180203 is an apocalyptic number.

28505180203 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28505180203 is a deficient number, since it is larger than the sum of its proper divisors (1250133365).

28505180203 is a wasteful number, since it uses less digits than its factorization.

28505180203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449093.

The product of its (nonzero) digits is 19200, while the sum is 34.

The spelling of 28505180203 in words is "twenty-eight billion, five hundred five million, one hundred eighty thousand, two hundred three".