685528319 has 4 divisors (see below), whose sum is σ = 783460944. Its totient is φ = 587595696.

The previous prime is 685528301. The next prime is 685528331. The reversal of 685528319 is 913825586.

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

It is a cyclic number.

It is not a de Polignac number, because 685528319 - 2¹⁶ = 685462783 is a prime.

It is a super-2 number, since 2×685528319² = 939898152301931522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685528369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48966302 + ... + 48966315.

It is an arithmetic number, because the mean of its divisors is an integer number (195865236).

Almost surely, 2^685528319 is an apocalyptic number.

685528319 is a deficient number, since it is larger than the sum of its proper divisors (97932625).

685528319 is an equidigital number, since it uses as much as digits as its factorization.

685528319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97932624.

The product of its digits is 518400, while the sum is 47.

The square root of 685528319 is about 26182.5957269328. The cubic root of 685528319 is about 881.7425522467.

The spelling of 685528319 in words is "six hundred eighty-five million, five hundred twenty-eight thousand, three hundred nineteen".