3655620 has 72 divisors (see below), whose sum is σ = 11583936. Its totient is φ = 931392.

The previous prime is 3655609. The next prime is 3655627. The reversal of 3655620 is 265563.

3655620 is a `hidden beast` number, since 3 + 655 + 6 + 2 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (3655627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3699 + ... + 4581.

It is an arithmetic number, because the mean of its divisors is an integer number (160888).

Almost surely, 2^3655620 is an apocalyptic number.

3655620 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3655620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5791968).

3655620 is an abundant number, since it is smaller than the sum of its proper divisors (7928316).

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

3655620 is a wasteful number, since it uses less digits than its factorization.

3655620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921 (or 916 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 3655620 is about 1911.9675729468. The cubic root of 3655620 is about 154.0471548406.

The spelling of 3655620 in words is "three million, six hundred fifty-five thousand, six hundred twenty".