815728469 has 2 divisors, whose sum is σ = 815728470. Its totient is φ = 815728468.

The previous prime is 815728429. The next prime is 815728471. The reversal of 815728469 is 964827518.

815728469 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 814417444 + 1311025 = 28538^2 + 1145^2 .

It is a cyclic number.

It is not a de Polignac number, because 815728469 - 2⁸ = 815728213 is a prime.

It is a super-2 number, since 2×815728469² = 1330825870274167922, which contains 22 as substring.

Together with 815728471, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (815728429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407864234 + 407864235.

It is an arithmetic number, because the mean of its divisors is an integer number (407864235).

Almost surely, 2^815728469 is an apocalyptic number.

It is an amenable number.

815728469 is a deficient number, since it is larger than the sum of its proper divisors (1).

815728469 is an equidigital number, since it uses as much as digits as its factorization.

815728469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 50.

The square root of 815728469 is about 28560.9605755829. The cubic root of 815728469 is about 934.3620836744.

The spelling of 815728469 in words is "eight hundred fifteen million, seven hundred twenty-eight thousand, four hundred sixty-nine".