685452779 has 12 divisors (see below), whose sum is σ = 754065312. Its totient is φ = 622614960.

The previous prime is 685452751. The next prime is 685452853. The reversal of 685452779 is 977254586.

It is not a de Polignac number, because 685452779 - 2¹² = 685448683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 685452779.

It is not an unprimeable number, because it can be changed into a prime (685452479) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 275489 + ... + 277965.

It is an arithmetic number, because the mean of its divisors is an integer number (62838776).

Almost surely, 2^685452779 is an apocalyptic number.

685452779 is a deficient number, since it is larger than the sum of its proper divisors (68612533).

685452779 is a wasteful number, since it uses less digits than its factorization.

685452779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4786 (or 4775 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 53.

The square root of 685452779 is about 26181.1531258652. The cubic root of 685452779 is about 881.7101639523.

The spelling of 685452779 in words is "six hundred eighty-five million, four hundred fifty-two thousand, seven hundred seventy-nine".