8638728265 has 8 divisors (see below), whose sum is σ = 10391822280. Its totient is φ = 6894083712.

The previous prime is 8638728227. The next prime is 8638728389. The reversal of 8638728265 is 5628278368.

8638728265 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4231892809 + 4406835456 = 65053^2 + 66384^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 8638728265 - 2¹⁵ = 8638695497 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2110114 + ... + 2114203.

It is an arithmetic number, because the mean of its divisors is an integer number (1298977785).

Almost surely, 2^8638728265 is an apocalyptic number.

It is an amenable number.

8638728265 is a deficient number, since it is larger than the sum of its proper divisors (1753094015).

8638728265 is a wasteful number, since it uses less digits than its factorization.

8638728265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4224731.

The product of its digits is 7741440, while the sum is 55.

The square root of 8638728265 is about 92944.7592121256. The cubic root of 8638728265 is about 2051.8704534673.

The spelling of 8638728265 in words is "eight billion, six hundred thirty-eight million, seven hundred twenty-eight thousand, two hundred sixty-five".