28807650805 has 8 divisors (see below), whose sum is σ = 34579189944. Its totient is φ = 23039448000.

The previous prime is 28807650803. The next prime is 28807650821. The reversal of 28807650805 is 50805670882.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 35688676 + 28771962129 = 5974^2 + 169623^2 .

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

It is not a de Polignac number, because 28807650805 - 2¹ = 28807650803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28807650803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 815046 + ... + 849655.

It is an arithmetic number, because the mean of its divisors is an integer number (4322398743).

Almost surely, 2^28807650805 is an apocalyptic number.

It is an amenable number.

28807650805 is a deficient number, since it is larger than the sum of its proper divisors (5771539139).

28807650805 is a wasteful number, since it uses less digits than its factorization.

28807650805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668167.

The product of its (nonzero) digits is 1075200, while the sum is 49.

The spelling of 28807650805 in words is "twenty-eight billion, eight hundred seven million, six hundred fifty thousand, eight hundred five".