817648385 has 16 divisors (see below), whose sum is σ = 1008861696. Its totient is φ = 635704128.

The previous prime is 817648357. The next prime is 817648387. The reversal of 817648385 is 583846718.

It is a cyclic number.

It is not a de Polignac number, because 817648385 - 2¹⁴ = 817632001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (817648387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202052 + ... + 206058.

It is an arithmetic number, because the mean of its divisors is an integer number (63053856).

Almost surely, 2^817648385 is an apocalyptic number.

It is an amenable number.

817648385 is a deficient number, since it is larger than the sum of its proper divisors (191213311).

817648385 is a wasteful number, since it uses less digits than its factorization.

817648385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5152.

The product of its digits is 1290240, while the sum is 50.

The square root of 817648385 is about 28594.5516663577. The cubic root of 817648385 is about 935.0945541941.

The spelling of 817648385 in words is "eight hundred seventeen million, six hundred forty-eight thousand, three hundred eighty-five".