685056428 has 12 divisors (see below), whose sum is σ = 1370112912. Its totient is φ = 293595600.

The previous prime is 685056409. The next prime is 685056431. The reversal of 685056428 is 824650586.

685056428 is an admirable number.

It is a super-3 number, since 3×685056428³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12233123 + ... + 12233178.

It is an arithmetic number, because the mean of its divisors is an integer number (114176076).

Almost surely, 2^685056428 is an apocalyptic number.

It is an amenable number.

685056428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

685056428 is a wasteful number, since it uses less digits than its factorization.

685056428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24466312 (or 24466310 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 44.

The square root of 685056428 is about 26173.5826359327. The cubic root of 685056428 is about 881.5401867269.

The spelling of 685056428 in words is "six hundred eighty-five million, fifty-six thousand, four hundred twenty-eight".