28965776645 has 16 divisors (see below), whose sum is σ = 37436255472. Its totient is φ = 21388078080.

The previous prime is 28965776629. The next prime is 28965776647. The reversal of 28965776645 is 54667756982.

It can be written as a sum of positive squares in 8 ways, for example, as 81414529 + 28884362116 = 9023^2 + 169954^2 .

It is not a de Polignac number, because 28965776645 - 2⁴ = 28965776629 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28965776647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1248269 + ... + 1271261.

It is an arithmetic number, because the mean of its divisors is an integer number (2339765967).

Almost surely, 2^28965776645 is an apocalyptic number.

It is an amenable number.

28965776645 is a deficient number, since it is larger than the sum of its proper divisors (8470478827).

28965776645 is a wasteful number, since it uses less digits than its factorization.

28965776645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42392.

The product of its digits is 152409600, while the sum is 65.

The spelling of 28965776645 in words is "twenty-eight billion, nine hundred sixty-five million, seven hundred seventy-six thousand, six hundred forty-five".