685308897 has 128 divisors (see below), whose sum is σ = 1330667520. Its totient is φ = 338722560.

The previous prime is 685308893. The next prime is 685308901. The reversal of 685308897 is 798803586.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (685308893) and next prime (685308901).

It is not a de Polignac number, because 685308897 - 2² = 685308893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (685308893) 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 127 ways as a sum of consecutive naturals, for example, 3786147 + ... + 3786327.

It is an arithmetic number, because the mean of its divisors is an integer number (10395840).

Almost surely, 2^685308897 is an apocalyptic number.

685308897 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

685308897 is a deficient number, since it is larger than the sum of its proper divisors (645358623).

685308897 is a wasteful number, since it uses less digits than its factorization.

685308897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300 (or 294 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The square root of 685308897 is about 26178.4051653266. The cubic root of 685308897 is about 881.6484669722.

The spelling of 685308897 in words is "six hundred eighty-five million, three hundred eight thousand, eight hundred ninety-seven".