685105400 has 48 divisors (see below), whose sum is σ = 1820426640. Its totient is φ = 234892800.

The previous prime is 685105397. The next prime is 685105403. The reversal of 685105400 is 4501586.

It is a happy number.

685105400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (685105397) and next prime (685105403).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685105403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 243281 + ... + 246080.

It is an arithmetic number, because the mean of its divisors is an integer number (37925555).

Almost surely, 2^685105400 is an apocalyptic number.

It is an amenable number.

685105400 is an abundant number, since it is smaller than the sum of its proper divisors (1135321240).

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

685105400 is a wasteful number, since it uses less digits than its factorization.

685105400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489384 (or 489375 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 685105400 is about 26174.5181426516. The cubic root of 685105400 is about 881.5611921778.

Adding to 685105400 its reverse (4501586), we get a palindrome (689606986).

The spelling of 685105400 in words is "six hundred eighty-five million, one hundred five thousand, four hundred".