3685781785 has 16 divisors (see below), whose sum is σ = 5320828800. Its totient is φ = 2394372096.

The previous prime is 3685781773. The next prime is 3685781807. The reversal of 3685781785 is 5871875863.

It is a happy number.

It is not a de Polignac number, because 3685781785 - 2⁷ = 3685781657 is a prime.

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, 2770600 + ... + 2771929.

It is an arithmetic number, because the mean of its divisors is an integer number (332551800).

Almost surely, 2^3685781785 is an apocalyptic number.

3685781785 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3685781785 is a deficient number, since it is larger than the sum of its proper divisors (1635047015).

3685781785 is a wasteful number, since it uses less digits than its factorization.

3685781785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5542560.

The product of its digits is 11289600, while the sum is 58.

The square root of 3685781785 is about 60710.6398006149. The cubic root of 3685781785 is about 1544.6966563718.

The spelling of 3685781785 in words is "three billion, six hundred eighty-five million, seven hundred eighty-one thousand, seven hundred eighty-five".