10778209 has 4 divisors (see below), whose sum is σ = 11607316. Its totient is φ = 9949104.

The previous prime is 10778197. The next prime is 10778219. The reversal of 10778209 is 90287701.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2712609 + 8065600 = 1647^2 + 2840^2 .

It is a cyclic number.

It is not a de Polignac number, because 10778209 - 2⁷ = 10778081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10778219) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 414534 + ... + 414559.

It is an arithmetic number, because the mean of its divisors is an integer number (2901829).

Almost surely, 2^10778209 is an apocalyptic number.

It is an amenable number.

10778209 is a deficient number, since it is larger than the sum of its proper divisors (829107).

10778209 is an equidigital number, since it uses as much as digits as its factorization.

10778209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829106.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 10778209 is about 3283.0182759162. The cubic root of 10778209 is about 220.8931255047.

The spelling of 10778209 in words is "ten million, seven hundred seventy-eight thousand, two hundred nine".