685019400 has 192 divisors, whose sum is σ = 2361515520. Its totient is φ = 163123200.

The previous prime is 685019389. The next prime is 685019429. The reversal of 685019400 is 4910586.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 240384 + ... + 243216.

It is an arithmetic number, because the mean of its divisors is an integer number (12299560).

Almost surely, 2^685019400 is an apocalyptic number.

685019400 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 685019400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1180757760).

685019400 is an abundant number, since it is smaller than the sum of its proper divisors (1676496120).

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

685019400 is a wasteful number, since it uses less digits than its factorization.

685019400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2896 (or 2887 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 685019400 is about 26172.8752719299. The cubic root of 685019400 is about 881.5243037248.

Adding to 685019400 its reverse (4910586), we get a palindrome (689929986).

The spelling of 685019400 in words is "six hundred eighty-five million, nineteen thousand, four hundred".