3621640 has 32 divisors (see below), whose sum is σ = 8890560. Its totient is φ = 1316800.

The previous prime is 3621623. The next prime is 3621643. The reversal of 3621640 is 461263.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (3621643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3676 + ... + 4555.

It is an arithmetic number, because the mean of its divisors is an integer number (277830).

Almost surely, 2^3621640 is an apocalyptic number.

It is an amenable number.

3621640 is an abundant number, since it is smaller than the sum of its proper divisors (5268920).

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

3621640 is a wasteful number, since it uses less digits than its factorization.

3621640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8253 (or 8249 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 3621640 is about 1903.0606926738. The cubic root of 3621640 is about 153.5683646148.

It can be divided in two parts, 362 and 1640, that added together give a palindrome (2002).

The spelling of 3621640 in words is "three million, six hundred twenty-one thousand, six hundred forty".