3656620 has 36 divisors (see below), whose sum is σ = 8446032. Its totient is φ = 1328800.

The previous prime is 3656617. The next prime is 3656621. The reversal of 3656620 is 266563.

It is not an unprimeable number, because it can be changed into a prime (3656621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1665 + ... + 3175.

It is an arithmetic number, because the mean of its divisors is an integer number (234612).

Almost surely, 2^3656620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3656620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4223016).

3656620 is an abundant number, since it is smaller than the sum of its proper divisors (4789412).

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

3656620 is a wasteful number, since it uses less digits than its factorization.

3656620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1542 (or 1529 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 3656620 is about 1912.2290657764. The cubic root of 3656620 is about 154.0612001654.

The spelling of 3656620 in words is "three million, six hundred fifty-six thousand, six hundred twenty".