28431818019 has 20 divisors (see below), whose sum is σ = 46333334520. Its totient is φ = 17231404320.

The previous prime is 28431817957. The next prime is 28431818021. The reversal of 28431818019 is 91081813482.

28431818019 is a `hidden beast` number, since 28 + 431 + 8 + 180 + 19 = 666.

It is not a de Polignac number, because 28431818019 - 2²¹ = 28429720867 is a prime.

It is a super-2 number, since 2×28431818019² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28431818059) 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 19 ways as a sum of consecutive naturals, for example, 15954114 + ... + 15955895.

It is an arithmetic number, because the mean of its divisors is an integer number (2316666726).

Almost surely, 2^28431818019 is an apocalyptic number.

28431818019 is a deficient number, since it is larger than the sum of its proper divisors (17901516501).

28431818019 is a wasteful number, since it uses less digits than its factorization.

28431818019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31910032 (or 31910023 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The spelling of 28431818019 in words is "twenty-eight billion, four hundred thirty-one million, eight hundred eighteen thousand, nineteen".