685528434 has 80 divisors (see below), whose sum is σ = 1654408800. Its totient is φ = 211372416.

The previous prime is 685528429. The next prime is 685528453. The reversal of 685528434 is 434825586.

685528434 is a `hidden beast` number, since 6 + 85 + 528 + 43 + 4 = 666.

685528434 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 685528434.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 160377 + ... + 164595.

It is an arithmetic number, because the mean of its divisors is an integer number (20680110).

Almost surely, 2^685528434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685528434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (827204400).

685528434 is an abundant number, since it is smaller than the sum of its proper divisors (968880366).

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

685528434 is a wasteful number, since it uses less digits than its factorization.

685528434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4309 (or 4300 counting only the distinct ones).

The product of its digits is 921600, while the sum is 45.

The square root of 685528434 is about 26182.5979230480. The cubic root of 685528434 is about 881.7426015519.

The spelling of 685528434 in words is "six hundred eighty-five million, five hundred twenty-eight thousand, four hundred thirty-four".