3281781685 has 32 divisors (see below), whose sum is σ = 4852108800. Its totient is φ = 2075044608.

The previous prime is 3281781683. The next prime is 3281781689. The reversal of 3281781685 is 5861871823.

It is not a de Polignac number, because 3281781685 - 2¹ = 3281781683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3281781683) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 494016 + ... + 500614.

It is an arithmetic number, because the mean of its divisors is an integer number (151628400).

Almost surely, 2^3281781685 is an apocalyptic number.

3281781685 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3281781685 is a deficient number, since it is larger than the sum of its proper divisors (1570327115).

3281781685 is a wasteful number, since it uses less digits than its factorization.

3281781685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7717.

The product of its digits is 645120, while the sum is 49.

The square root of 3281781685 is about 57286.8369261212. The cubic root of 3281781685 is about 1486.0607452946.

The spelling of 3281781685 in words is "three billion, two hundred eighty-one million, seven hundred eighty-one thousand, six hundred eighty-five".