685280544 has 96 divisors (see below), whose sum is σ = 1999839744. Its totient is φ = 204042240.

The previous prime is 685280521. The next prime is 685280567. The reversal of 685280544 is 445082586.

It is an interprime number because it is at equal distance from previous prime (685280521) and next prime (685280567).

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 685280496 and 685280505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29832 + ... + 47544.

It is an arithmetic number, because the mean of its divisors is an integer number (20831664).

Almost surely, 2^685280544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685280544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (999919872).

685280544 is an abundant number, since it is smaller than the sum of its proper divisors (1314559200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685280544 is a wasteful number, since it uses less digits than its factorization.

685280544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17770 (or 17762 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 42.

The square root of 685280544 is about 26177.8636255902. The cubic root of 685280544 is about 881.6363081128.

The spelling of 685280544 in words is "six hundred eighty-five million, two hundred eighty thousand, five hundred forty-four".