28371897205 has 8 divisors (see below), whose sum is σ = 34056879192. Its totient is φ = 22690449408.

The previous prime is 28371897199. The next prime is 28371897259. The reversal of 28371897205 is 50279817382.

It can be written as a sum of positive squares in 4 ways, for example, as 18367296676 + 10004600529 = 135526^2 + 100023^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28371897205 - 2¹⁷ = 28371766133 is a prime.

It is a super-2 number, since 2×28371897205² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 865852 + ... + 898021.

It is an arithmetic number, because the mean of its divisors is an integer number (4257109899).

Almost surely, 2^28371897205 is an apocalyptic number.

It is an amenable number.

28371897205 is a deficient number, since it is larger than the sum of its proper divisors (5684981987).

28371897205 is a wasteful number, since it uses less digits than its factorization.

28371897205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1767095.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 28371897205 in words is "twenty-eight billion, three hundred seventy-one million, eight hundred ninety-seven thousand, two hundred five".