3581644 has 12 divisors (see below), whose sum is σ = 6837768. Its totient is φ = 1628000.

The previous prime is 3581639. The next prime is 3581651. The reversal of 3581644 is 4461853.

It is a happy number.

It is a nialpdrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40657 + ... + 40744.

It is an arithmetic number, because the mean of its divisors is an integer number (569814).

Almost surely, 2^3581644 is an apocalyptic number.

It is an amenable number.

3581644 is a deficient number, since it is larger than the sum of its proper divisors (3256124).

3581644 is a wasteful number, since it uses less digits than its factorization.

3581644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81416 (or 81414 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 3581644 is about 1892.5231834775. The cubic root of 3581644 is about 153.0009540431. Note that the first 3 decimals are identical.

It can be divided in two parts, 3581 and 644, that added together give a square (4225 = 65²).

The spelling of 3581644 in words is "three million, five hundred eighty-one thousand, six hundred forty-four".