3687661 has 4 divisors (see below), whose sum is σ = 3699612. Its totient is φ = 3675712.

The previous prime is 3687631. The next prime is 3687683. The reversal of 3687661 is 1667863.

3687661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1188100 + 2499561 = 1090^2 + 1581^2 .

It is a cyclic number.

It is not a de Polignac number, because 3687661 - 2¹⁹ = 3163373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3687661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3687631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5500 + ... + 6133.

It is an arithmetic number, because the mean of its divisors is an integer number (924903).

Almost surely, 2^3687661 is an apocalyptic number.

It is an amenable number.

3687661 is a deficient number, since it is larger than the sum of its proper divisors (11951).

3687661 is a wasteful number, since it uses less digits than its factorization.

3687661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11950.

The product of its digits is 36288, while the sum is 37.

The square root of 3687661 is about 1920.3283573389. The cubic root of 3687661 is about 154.4959135641.

The spelling of 3687661 in words is "three million, six hundred eighty-seven thousand, six hundred sixty-one".