3530640 has 80 divisors (see below), whose sum is σ = 11213568. Its totient is φ = 918528.

The previous prime is 3530629. The next prime is 3530647. The reversal of 3530640 is 460353.

It is a Cunningham number, because it is equal to 1879²-1.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (3530647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11124 + ... + 11436.

Almost surely, 2^3530640 is an apocalyptic number.

3530640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3530640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5606784).

3530640 is an abundant number, since it is smaller than the sum of its proper divisors (7682928).

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

3530640 is a wasteful number, since it uses less digits than its factorization.

3530640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376 (or 370 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 3530640 is about 1878.9997339010. Note that the first 3 decimals coincide. The cubic root of 3530640 is about 152.2712147659.

Adding to 3530640 its reverse (460353), we get a palindrome (3990993).

The spelling of 3530640 in words is "three million, five hundred thirty thousand, six hundred forty".