1685684736 has 160 divisors (see below), whose sum is σ = 5074080000. Its totient is φ = 552407040.

The previous prime is 1685684723. The next prime is 1685684747. The reversal of 1685684736 is 6374865861.

1685684736 is a `hidden beast` number, since 1 + 6 + 8 + 568 + 4 + 73 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 842265 + ... + 844263.

It is an arithmetic number, because the mean of its divisors is an integer number (31713000).

Almost surely, 2^1685684736 is an apocalyptic number.

1685684736 is a gapful number since it is divisible by the number (16) 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 1685684736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2537040000).

1685684736 is an abundant number, since it is smaller than the sum of its proper divisors (3388395264).

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

1685684736 is an equidigital number, since it uses as much as digits as its factorization.

1685684736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2087 (or 2065 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The square root of 1685684736 is about 41057.0911780170. The cubic root of 1685684736 is about 1190.1237392219.

The spelling of 1685684736 in words is "one billion, six hundred eighty-five million, six hundred eighty-four thousand, seven hundred thirty-six".