685396128 has 24 divisors (see below), whose sum is σ = 1799165088. Its totient is φ = 228465344.

The previous prime is 685396111. The next prime is 685396141. The reversal of 685396128 is 821693586.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 3569676 + ... + 3569867.

It is an arithmetic number, because the mean of its divisors is an integer number (74965212).

Almost surely, 2^685396128 is an apocalyptic number.

It is an amenable number.

685396128 is an abundant number, since it is smaller than the sum of its proper divisors (1113768960).

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

685396128 is a wasteful number, since it uses less digits than its factorization.

685396128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7139556 (or 7139548 counting only the distinct ones).

The product of its digits is 622080, while the sum is 48.

The square root of 685396128 is about 26180.0711992920. The cubic root of 685396128 is about 881.6858728851.

The spelling of 685396128 in words is "six hundred eighty-five million, three hundred ninety-six thousand, one hundred twenty-eight".