28920623089 has 4 divisors (see below), whose sum is σ = 28924304356. Its totient is φ = 28916941824.

The previous prime is 28920623077. The next prime is 28920623093. The reversal of 28920623089 is 98032602982.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13550822464 + 15369800625 = 116408^2 + 123975^2 .

It is a cyclic number.

It is not a de Polignac number, because 28920623089 - 2¹⁷ = 28920492017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28920623029) 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, 1828824 + ... + 1844569.

It is an arithmetic number, because the mean of its divisors is an integer number (7231076089).

Almost surely, 2^28920623089 is an apocalyptic number.

It is an amenable number.

28920623089 is a deficient number, since it is larger than the sum of its proper divisors (3681267).

28920623089 is an equidigital number, since it uses as much as digits as its factorization.

28920623089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3681266.

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

The spelling of 28920623089 in words is "twenty-eight billion, nine hundred twenty million, six hundred twenty-three thousand, eighty-nine".