28285260509 has 4 divisors (see below), whose sum is σ = 30856647840. Its totient is φ = 25713873180.

The previous prime is 28285260481. The next prime is 28285260517. The reversal of 28285260509 is 90506258282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28285260509 - 2¹² = 28285256413 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 (28285260559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1285693649 + ... + 1285693670.

It is an arithmetic number, because the mean of its divisors is an integer number (7714161960).

Almost surely, 2^28285260509 is an apocalyptic number.

It is an amenable number.

28285260509 is a deficient number, since it is larger than the sum of its proper divisors (2571387331).

28285260509 is a wasteful number, since it uses less digits than its factorization.

28285260509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2571387330.

The product of its (nonzero) digits is 691200, while the sum is 47.

The spelling of 28285260509 in words is "twenty-eight billion, two hundred eighty-five million, two hundred sixty thousand, five hundred nine".