28145949205 has 16 divisors (see below), whose sum is σ = 37071664704. Its totient is φ = 20344193280.

The previous prime is 28145949203. The next prime is 28145949239. The reversal of 28145949205 is 50294954182.

It is not a de Polignac number, because 28145949205 - 2¹ = 28145949203 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 (28145949203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1560804 + ... + 1578733.

It is an arithmetic number, because the mean of its divisors is an integer number (2316979044).

Almost surely, 2^28145949205 is an apocalyptic number.

It is an amenable number.

28145949205 is a deficient number, since it is larger than the sum of its proper divisors (8925715499).

28145949205 is a wasteful number, since it uses less digits than its factorization.

28145949205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3139716.

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 28145949205 in words is "twenty-eight billion, one hundred forty-five million, nine hundred forty-nine thousand, two hundred five".