636272865 has 12 divisors (see below), whose sum is σ = 1102873044. Its totient is φ = 339345504.

The previous prime is 636272843. The next prime is 636272867. The reversal of 636272865 is 568272636.

It is a happy number.

636272865 is a `hidden beast` number, since 6 + 362 + 7 + 286 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 273141729 + 363131136 = 16527^2 + 19056^2 .

It is not a de Polignac number, because 636272865 - 2⁹ = 636272353 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 14139397 = 636272865 / (6 + 3 + 6 + 2 + 7 + 2 + 8 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 636272865.

It is not an unprimeable number, because it can be changed into a prime (636272867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7069654 + ... + 7069743.

It is an arithmetic number, because the mean of its divisors is an integer number (91906087).

Almost surely, 2^636272865 is an apocalyptic number.

It is an amenable number.

636272865 is a deficient number, since it is larger than the sum of its proper divisors (466600179).

636272865 is a wasteful number, since it uses less digits than its factorization.

636272865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14139408 (or 14139405 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 636272865 is about 25224.4497462284. The cubic root of 636272865 is about 860.0977286631.

The spelling of 636272865 in words is "six hundred thirty-six million, two hundred seventy-two thousand, eight hundred sixty-five".