3620561 has 12 divisors (see below), whose sum is σ = 4327668. Its totient is φ = 3017952.

The previous prime is 3620537. The next prime is 3620567. The reversal of 3620561 is 1650263.

It can be written as a sum of positive squares in 2 ways, for example, as 1500625 + 2119936 = 1225^2 + 1456^2 .

It is not a de Polignac number, because 3620561 - 2⁶ = 3620497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3620567) 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, 815 + ... + 2811.

It is an arithmetic number, because the mean of its divisors is an integer number (360639).

Almost surely, 2^3620561 is an apocalyptic number.

It is an amenable number.

3620561 is a deficient number, since it is larger than the sum of its proper divisors (707107).

3620561 is a wasteful number, since it uses less digits than its factorization.

3620561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2048 (or 2041 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 3620561 is about 1902.7771808596. Note that the first 3 decimals coincide. The cubic root of 3620561 is about 153.5531121579.

The spelling of 3620561 in words is "three million, six hundred twenty thousand, five hundred sixty-one".