685280505 has 64 divisors (see below), whose sum is σ = 1420554240. Its totient is φ = 273943296.

The previous prime is 685280473. The next prime is 685280521. The reversal of 685280505 is 505082586.

685280505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 685280505 - 2⁵ = 685280473 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12724 + ... + 39146.

It is an arithmetic number, because the mean of its divisors is an integer number (22196160).

Almost surely, 2^685280505 is an apocalyptic number.

685280505 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

685280505 is an abundant number, since it is smaller than the sum of its proper divisors (735273735).

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

685280505 is a wasteful number, since it uses less digits than its factorization.

685280505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26470.

The product of its (nonzero) digits is 96000, while the sum is 39.

The square root of 685280505 is about 26177.8628806860. The cubic root of 685280505 is about 881.6362913878.

The spelling of 685280505 in words is "six hundred eighty-five million, two hundred eighty thousand, five hundred five".