28228906039 has 4 divisors (see below), whose sum is σ = 28615603456. Its totient is φ = 27842208624.

The previous prime is 28228906021. The next prime is 28228906051. The reversal of 28228906039 is 93060982282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28228906039 - 2¹⁵ = 28228873271 is a prime.

It is a super-2 number, since 2×28228906039² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28228905983 and 28228906001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28228906009) 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, 193348599 + ... + 193348744.

It is an arithmetic number, because the mean of its divisors is an integer number (7153900864).

Almost surely, 2^28228906039 is an apocalyptic number.

28228906039 is a deficient number, since it is larger than the sum of its proper divisors (386697417).

28228906039 is an equidigital number, since it uses as much as digits as its factorization.

28228906039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386697416.

The product of its (nonzero) digits is 746496, while the sum is 49.

The spelling of 28228906039 in words is "twenty-eight billion, two hundred twenty-eight million, nine hundred six thousand, thirty-nine".