685288827 has 18 divisors (see below), whose sum is σ = 1044706572. Its totient is φ = 432811944.

The previous prime is 685288817. The next prime is 685288837. The reversal of 685288827 is 728882586.

It is an interprime number because it is at equal distance from previous prime (685288817) and next prime (685288837).

It is not a de Polignac number, because 685288827 - 2⁷ = 685288699 is a prime.

It is a super-2 number, since 2×685288827² = 939241552822071858, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (685288817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 102213 + ... + 108710.

It is an arithmetic number, because the mean of its divisors is an integer number (58039254).

Almost surely, 2^685288827 is an apocalyptic number.

685288827 is a deficient number, since it is larger than the sum of its proper divisors (359417745).

685288827 is a wasteful number, since it uses less digits than its factorization.

685288827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210967 (or 210945 counting only the distinct ones).

The product of its digits is 3440640, while the sum is 54.

The square root of 685288827 is about 26178.0218312996. The cubic root of 685288827 is about 881.6398602172.

The spelling of 685288827 in words is "six hundred eighty-five million, two hundred eighty-eight thousand, eight hundred twenty-seven".