3642661 has 16 divisors (see below), whose sum is σ = 4334400. Its totient is φ = 3024000.

The previous prime is 3642649. The next prime is 3642673. The reversal of 3642661 is 1662463.

It is an interprime number because it is at equal distance from previous prime (3642649) and next prime (3642673).

It is a 4-Lehmer number, since φ(3642661) divides (3642661-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 3642661 - 2⁵ = 3642629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3642631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5761 + ... + 6361.

It is an arithmetic number, because the mean of its divisors is an integer number (270900).

Almost surely, 2^3642661 is an apocalyptic number.

It is an amenable number.

3642661 is a deficient number, since it is larger than the sum of its proper divisors (691739).

3642661 is a wasteful number, since it uses less digits than its factorization.

3642661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660.

The product of its digits is 5184, while the sum is 28.

The square root of 3642661 is about 1908.5756469158. The cubic root of 3642661 is about 153.8649093608.

It can be divided in two parts, 364 and 2661, that added together give a square (3025 = 55²).

The spelling of 3642661 in words is "three million, six hundred forty-two thousand, six hundred sixty-one".