3621620 has 12 divisors (see below), whose sum is σ = 7605444. Its totient is φ = 1448640.

The previous prime is 3621617. The next prime is 3621623. The reversal of 3621620 is 261263.

It is an interprime number because it is at equal distance from previous prime (3621617) and next prime (3621623).

It can be written as a sum of positive squares in 2 ways, for example, as 481636 + 3139984 = 694^2 + 1772^2 .

It is a super-2 number, since 2×3621620² = 26232262848800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 181081 = 3621620 / (3 + 6 + 2 + 1 + 6 + 2 + 0).

It is a d-powerful number, because it can be written as 3⁵ + 6⁸ + 2¹⁷ + 1 + 6⁸ + 2¹⁷ + 0 .

It is a junction number, because it is equal to n+sod(n) for n = 3621592 and 3621601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3621623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90521 + ... + 90560.

It is an arithmetic number, because the mean of its divisors is an integer number (633787).

Almost surely, 2^3621620 is an apocalyptic number.

It is an amenable number.

3621620 is an abundant number, since it is smaller than the sum of its proper divisors (3983824).

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

3621620 is a wasteful number, since it uses less digits than its factorization.

3621620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181090 (or 181088 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 3621620 is about 1903.0554379734. The cubic root of 3621620 is about 153.5680819276.

Adding to 3621620 its reverse (261263), we get a palindrome (3882883).

The spelling of 3621620 in words is "three million, six hundred twenty-one thousand, six hundred twenty".