685211400 has 288 divisors, whose sum is σ = 2494215360. Its totient is φ = 174493440.

The previous prime is 685211389. The next prime is 685211437. The reversal of 685211400 is 4112586.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1117494 + ... + 1118106.

It is an arithmetic number, because the mean of its divisors is an integer number (8660470).

Almost surely, 2^685211400 is an apocalyptic number.

685211400 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685211400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1247107680).

685211400 is an abundant number, since it is smaller than the sum of its proper divisors (1809003960).

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

685211400 is a wasteful number, since it uses less digits than its factorization.

685211400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667 (or 646 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 685211400 is about 26176.5429344671. The cubic root of 685211400 is about 881.6066550936.

Adding to 685211400 its reverse (4112586), we get a palindrome (689323986).

The spelling of 685211400 in words is "six hundred eighty-five million, two hundred eleven thousand, four hundred".