28169893749 has 8 divisors (see below), whose sum is σ = 37855605760. Its totient is φ = 18632055456.

The previous prime is 28169893733. The next prime is 28169893751. The reversal of 28169893749 is 94739896182.

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

It is not a de Polignac number, because 28169893749 - 2⁴ = 28169893733 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28169893749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28169893709) 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, 36967984 + ... + 36968745.

It is an arithmetic number, because the mean of its divisors is an integer number (4731950720).

Almost surely, 2^28169893749 is an apocalyptic number.

It is an amenable number.

28169893749 is a deficient number, since it is larger than the sum of its proper divisors (9685712011).

28169893749 is a wasteful number, since it uses less digits than its factorization.

28169893749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73936859.

The product of its digits is 47029248, while the sum is 66.

The spelling of 28169893749 in words is "twenty-eight billion, one hundred sixty-nine million, eight hundred ninety-three thousand, seven hundred forty-nine".