3686546781 has 24 divisors (see below), whose sum is σ = 5645760120. Its totient is φ = 2310045696.

The previous prime is 3686546719. The next prime is 3686546791. The reversal of 3686546781 is 1876456863.

It can be written as a sum of positive squares in 4 ways, for example, as 2142764100 + 1543782681 = 46290^2 + 39291^2 .

It is not a de Polignac number, because 3686546781 - 2¹³ = 3686538589 is a prime.

It is a super-2 number, since 2×3686546781² = 27181254337002923922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3686546711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101991 + ... + 133323.

It is an arithmetic number, because the mean of its divisors is an integer number (235240005).

Almost surely, 2^3686546781 is an apocalyptic number.

It is an amenable number.

3686546781 is a deficient number, since it is larger than the sum of its proper divisors (1959213339).

3686546781 is a wasteful number, since it uses less digits than its factorization.

3686546781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32125 (or 32122 counting only the distinct ones).

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

The square root of 3686546781 is about 60716.9398191312. The cubic root of 3686546781 is about 1544.8035179177.

The spelling of 3686546781 in words is "three billion, six hundred eighty-six million, five hundred forty-six thousand, seven hundred eighty-one".