685455140 has 12 divisors (see below), whose sum is σ = 1439455836. Its totient is φ = 274182048.

The previous prime is 685455139. The next prime is 685455143. The reversal of 685455140 is 41554586.

It is a happy number.

685455140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 435056164 + 250398976 = 20858^2 + 15824^2 .

It is a junction number, because it is equal to n+sod(n) for n = 685455094 and 685455103.

It is not an unprimeable number, because it can be changed into a prime (685455143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17136359 + ... + 17136398.

It is an arithmetic number, because the mean of its divisors is an integer number (119954653).

Almost surely, 2^685455140 is an apocalyptic number.

It is an amenable number.

685455140 is an abundant number, since it is smaller than the sum of its proper divisors (754000696).

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

685455140 is a wasteful number, since it uses less digits than its factorization.

685455140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34272766 (or 34272764 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 38.

The square root of 685455140 is about 26181.1982155134. The cubic root of 685455140 is about 881.7111762833.

The spelling of 685455140 in words is "six hundred eighty-five million, four hundred fifty-five thousand, one hundred forty".