3640624 has 40 divisors (see below), whose sum is σ = 7936992. Its totient is φ = 1605120.

The previous prime is 3640597. The next prime is 3640633. The reversal of 3640624 is 4260463.

3640624 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

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 7 ways as a sum of consecutive naturals, for example, 4404 + ... + 5164.

Almost surely, 2^3640624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3640624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3968496).

3640624 is an abundant number, since it is smaller than the sum of its proper divisors (4296368).

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

3640624 is a wasteful number, since it uses less digits than its factorization.

3640624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805 (or 799 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 3640624 is about 1908.0419282605. The cubic root of 3640624 is about 153.8362232564.

The spelling of 3640624 in words is "three million, six hundred forty thousand, six hundred twenty-four".