28285542509 has 8 divisors (see below), whose sum is σ = 32344003968. Its totient is φ = 24231498480.

The previous prime is 28285542427. The next prime is 28285542517. The reversal of 28285542509 is 90524558282.

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

It is a de Polignac number, because none of the positive numbers 2^k-28285542509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28285542409) 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, 1090622 + ... + 1116255.

It is an arithmetic number, because the mean of its divisors is an integer number (4043000496).

Almost surely, 2^28285542509 is an apocalyptic number.

It is an amenable number.

28285542509 is a deficient number, since it is larger than the sum of its proper divisors (4058461459).

28285542509 is a wasteful number, since it uses less digits than its factorization.

28285542509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2208715.

The product of its (nonzero) digits is 2304000, while the sum is 50.

The spelling of 28285542509 in words is "twenty-eight billion, two hundred eighty-five million, five hundred forty-two thousand, five hundred nine".