1685209104 has 320 divisors, whose sum is σ = 5428224000. Its totient is φ = 498286080.

The previous prime is 1685209091. The next prime is 1685209157. The reversal of 1685209104 is 4019025861.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9414487 + ... + 9414665.

It is an arithmetic number, because the mean of its divisors is an integer number (16963200).

Almost surely, 2^1685209104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1685209104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2714112000).

1685209104 is an abundant number, since it is smaller than the sum of its proper divisors (3743014896).

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

1685209104 is a wasteful number, since it uses less digits than its factorization.

1685209104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283 (or 271 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 1685209104 is about 41051.2984447508. The cubic root of 1685209104 is about 1190.0117937771.

The spelling of 1685209104 in words is "one billion, six hundred eighty-five million, two hundred nine thousand, one hundred four".