685428 has 12 divisors (see below), whose sum is σ = 1599360. Its totient is φ = 228472.

The previous prime is 685427. The next prime is 685429. The reversal of 685428 is 824586.

It is an interprime number because it is at equal distance from previous prime (685427) and next prime (685429).

It is a tau number, because it is divible by the number of its divisors (12).

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685427) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 28548 + ... + 28571.

It is an arithmetic number, because the mean of its divisors is an integer number (133280).

2⁶⁸⁵⁴²⁸ is an apocalyptic number.

It is an amenable number.

685428 is an abundant number, since it is smaller than the sum of its proper divisors (913932).

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

685428 is a wasteful number, since it uses less digits than its factorization.

685428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57126 (or 57124 counting only the distinct ones).

The product of its digits is 15360, while the sum is 33.

The square root of 685428 is about 827.9057917420. The cubic root of 685428 is about 88.1699539267.

The spelling of 685428 in words is "six hundred eighty-five thousand, four hundred twenty-eight".