28044005065 has 8 divisors (see below), whose sum is σ = 33717401928. Its totient is φ = 22392140160.

The previous prime is 28044005047. The next prime is 28044005123. The reversal of 28044005065 is 56050044082.

It can be written as a sum of positive squares in 4 ways, for example, as 3808988089 + 24235016976 = 61717^2 + 155676^2 .

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

It is not a de Polignac number, because 28044005065 - 2²³ = 28035616457 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28044005065.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5380122 + ... + 5385331.

It is an arithmetic number, because the mean of its divisors is an integer number (4214675241).

Almost surely, 2^28044005065 is an apocalyptic number.

It is an amenable number.

28044005065 is a deficient number, since it is larger than the sum of its proper divisors (5673396863).

28044005065 is a wasteful number, since it uses less digits than its factorization.

28044005065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10765979.

The product of its (nonzero) digits is 38400, while the sum is 34.

The spelling of 28044005065 in words is "twenty-eight billion, forty-four million, five thousand, sixty-five".