28018727837 has 4 divisors (see below), whose sum is σ = 29666888316. Its totient is φ = 26370567360.

The previous prime is 28018727831. The next prime is 28018727851. The reversal of 28018727837 is 73872781082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21600474841 + 6418252996 = 146971^2 + 80114^2 .

It is a cyclic number.

It is not a de Polignac number, because 28018727837 - 2¹² = 28018723741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28018727831) 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 3 ways as a sum of consecutive naturals, for example, 824080214 + ... + 824080247.

It is an arithmetic number, because the mean of its divisors is an integer number (7416722079).

Almost surely, 2^28018727837 is an apocalyptic number.

It is an amenable number.

28018727837 is a deficient number, since it is larger than the sum of its proper divisors (1648160479).

28018727837 is a wasteful number, since it uses less digits than its factorization.

28018727837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648160478.

The product of its (nonzero) digits is 2107392, while the sum is 53.

The spelling of 28018727837 in words is "twenty-eight billion, eighteen million, seven hundred twenty-seven thousand, eight hundred thirty-seven".