685828505 has 4 divisors (see below), whose sum is σ = 822994212. Its totient is φ = 548662800.

The previous prime is 685828499. The next prime is 685828523. The reversal of 685828505 is 505828586.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 243609664 + 442218841 = 15608^2 + 21029^2 .

It is not a de Polignac number, because 685828505 - 2¹⁴ = 685812121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 685828505.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68582846 + ... + 68582855.

It is an arithmetic number, because the mean of its divisors is an integer number (205748553).

Almost surely, 2^685828505 is an apocalyptic number.

It is an amenable number.

685828505 is a deficient number, since it is larger than the sum of its proper divisors (137165707).

685828505 is a wasteful number, since it uses less digits than its factorization.

685828505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137165706.

The product of its (nonzero) digits is 768000, while the sum is 47.

The square root of 685828505 is about 26188.3276480191. The cubic root of 685828505 is about 881.8712355494.

The spelling of 685828505 in words is "six hundred eighty-five million, eight hundred twenty-eight thousand, five hundred five".