685342928 has 20 divisors (see below), whose sum is σ = 1333026660. Its totient is φ = 341336064.

The previous prime is 685342883. The next prime is 685342949. The reversal of 685342928 is 829243586.

It can be written as a sum of positive squares in 2 ways, for example, as 587965504 + 97377424 = 24248^2 + 9868^2 .

It is a super-2 number, since 2×685342928² = 939389857919226368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 79223 + ... + 87446.

It is an arithmetic number, because the mean of its divisors is an integer number (66651333).

Almost surely, 2^685342928 is an apocalyptic number.

It is an amenable number.

685342928 is a deficient number, since it is larger than the sum of its proper divisors (647683732).

685342928 is a wasteful number, since it uses less digits than its factorization.

685342928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166934 (or 166928 counting only the distinct ones).

The product of its digits is 829440, while the sum is 47.

The square root of 685342928 is about 26179.0551395577. The cubic root of 685342928 is about 881.6630603342.

The spelling of 685342928 in words is "six hundred eighty-five million, three hundred forty-two thousand, nine hundred twenty-eight".