3643656 has 32 divisors (see below), whose sum is σ = 9176640. Its totient is φ = 1205568.

The previous prime is 3643639. The next prime is 3643657. The reversal of 3643656 is 6563463.

It is a happy number.

It is a super-3 number, since 3×3643656³ (a number of 21 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (3643657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3285 + ... + 4251.

It is an arithmetic number, because the mean of its divisors is an integer number (286770).

Almost surely, 2^3643656 is an apocalyptic number.

It is an amenable number.

3643656 is an abundant number, since it is smaller than the sum of its proper divisors (5532984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3643656 is a wasteful number, since it uses less digits than its factorization.

3643656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133 (or 1129 counting only the distinct ones).

The product of its digits is 38880, while the sum is 33.

The square root of 3643656 is about 1908.8362947094. The cubic root of 3643656 is about 153.8789175861.

The spelling of 3643656 in words is "three million, six hundred forty-three thousand, six hundred fifty-six".