3581640 has 48 divisors (see below), whose sum is σ = 11641500. Its totient is φ = 955008.

The previous prime is 3581639. The next prime is 3581651. The reversal of 3581640 is 461853.

3581640 is nontrivially palindromic in base 14.

3581640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 3526884 + 54756 = 1878^2 + 234^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4615 + ... + 5334.

Almost surely, 2^3581640 is an apocalyptic number.

3581640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3581640 is an abundant number, since it is smaller than the sum of its proper divisors (8059860).

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

3581640 is a wasteful number, since it uses less digits than its factorization.

3581640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9966 (or 9959 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 3581640 is about 1892.5221266870. The cubic root of 3581640 is about 153.0008970856. Note that the first 3 decimals are identical.

The spelling of 3581640 in words is "three million, five hundred eighty-one thousand, six hundred forty".