1685387680 has 48 divisors (see below), whose sum is σ = 4041182880. Its totient is φ = 664088832.

The previous prime is 1685387657. The next prime is 1685387699. The reversal of 1685387680 is 867835861.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67890 + ... + 89329.

It is an arithmetic number, because the mean of its divisors is an integer number (84191310).

Almost surely, 2^1685387680 is an apocalyptic number.

1685387680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1685387680 is an abundant number, since it is smaller than the sum of its proper divisors (2355795200).

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

1685387680 is a wasteful number, since it uses less digits than its factorization.

1685387680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157301 (or 157293 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 52.

The square root of 1685387680 is about 41053.4734218677. The cubic root of 1685387680 is about 1190.0538261556.

The spelling of 1685387680 in words is "one billion, six hundred eighty-five million, three hundred eighty-seven thousand, six hundred eighty".