28205980465 has 8 divisors (see below), whose sum is σ = 36450805608. Its totient is φ = 20829031680.

The previous prime is 28205980427. The next prime is 28205980477. The reversal of 28205980465 is 56408950282.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1725903936 + 26480076529 = 41544^2 + 162727^2 .

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

It is not a de Polignac number, because 28205980465 - 2¹⁷ = 28205849393 is a prime.

It is a Duffinian number.

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, 216969016 + ... + 216969145.

It is an arithmetic number, because the mean of its divisors is an integer number (4556350701).

Almost surely, 2^28205980465 is an apocalyptic number.

It is an amenable number.

28205980465 is a deficient number, since it is larger than the sum of its proper divisors (8244825143).

28205980465 is a wasteful number, since it uses less digits than its factorization.

28205980465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433938179.

The product of its (nonzero) digits is 1382400, while the sum is 49.

The spelling of 28205980465 in words is "twenty-eight billion, two hundred five million, nine hundred eighty thousand, four hundred sixty-five".