28355755809 has 16 divisors (see below), whose sum is σ = 37885486784. Its totient is φ = 18864964800.

The previous prime is 28355755801. The next prime is 28355755817. The reversal of 28355755809 is 90855755382.

It is an interprime number because it is at equal distance from previous prime (28355755801) and next prime (28355755817).

It is not a de Polignac number, because 28355755809 - 2³ = 28355755801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28355755801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5889087 + ... + 5893899.

It is an arithmetic number, because the mean of its divisors is an integer number (2367842924).

Almost surely, 2^28355755809 is an apocalyptic number.

It is an amenable number.

28355755809 is a deficient number, since it is larger than the sum of its proper divisors (9529730975).

28355755809 is a wasteful number, since it uses less digits than its factorization.

28355755809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8448.

The product of its (nonzero) digits is 15120000, while the sum is 57.

The spelling of 28355755809 in words is "twenty-eight billion, three hundred fifty-five million, seven hundred fifty-five thousand, eight hundred nine".