28385420089 has 8 divisors (see below), whose sum is σ = 30625425992. Its totient is φ = 26153487360.

The previous prime is 28385420071. The next prime is 28385420093. The reversal of 28385420089 is 98002458382.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6692548864 + 21692871225 = 81808^2 + 147285^2 .

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

It is not a de Polignac number, because 28385420089 - 2⁵ = 28385420057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28385420069) 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, 2010984 + ... + 2025049.

It is an arithmetic number, because the mean of its divisors is an integer number (3828178249).

Almost surely, 2^28385420089 is an apocalyptic number.

It is an amenable number.

28385420089 is a deficient number, since it is larger than the sum of its proper divisors (2240005903).

28385420089 is a wasteful number, since it uses less digits than its factorization.

28385420089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4036587.

The product of its (nonzero) digits is 1105920, while the sum is 49.

The spelling of 28385420089 in words is "twenty-eight billion, three hundred eighty-five million, four hundred twenty thousand, eighty-nine".