685148640 has 96 divisors (see below), whose sum is σ = 2354438016. Its totient is φ = 166095360.

The previous prime is 685148623. The next prime is 685148677. The reversal of 685148640 is 46841586.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 685148592 and 685148601.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 59602 + ... + 70161.

It is an arithmetic number, because the mean of its divisors is an integer number (24525396).

Almost surely, 2^685148640 is an apocalyptic number.

685148640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

685148640 is an abundant number, since it is smaller than the sum of its proper divisors (1669289376).

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

685148640 is a wasteful number, since it uses less digits than its factorization.

685148640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129792 (or 129784 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 42.

The square root of 685148640 is about 26175.3441238124. The cubic root of 685148640 is about 881.5797381825.

The spelling of 685148640 in words is "six hundred eighty-five million, one hundred forty-eight thousand, six hundred forty".