3656628 has 18 divisors (see below), whose sum is σ = 9243234. Its totient is φ = 1218864.

The previous prime is 3656621. The next prime is 3656633. The reversal of 3656628 is 8266563.

It can be written as a sum of positive squares in only one way, i.e., 3196944 + 459684 = 1788^2 + 678^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 101573 = 3656628 / (3 + 6 + 5 + 6 + 6 + 2 + 8).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 3656592 and 3656601.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 50751 + ... + 50822.

It is an arithmetic number, because the mean of its divisors is an integer number (513513).

Almost surely, 2^3656628 is an apocalyptic number.

It is an amenable number.

3656628 is an abundant number, since it is smaller than the sum of its proper divisors (5586606).

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

3656628 is a wasteful number, since it uses less digits than its factorization.

3656628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101583 (or 101578 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 3656628 is about 1912.2311575748. The cubic root of 3656628 is about 154.0613125177.

The spelling of 3656628 in words is "three million, six hundred fifty-six thousand, six hundred twenty-eight".