5643990 has 48 divisors (see below), whose sum is σ = 16011216. Its totient is φ = 1368000.

The previous prime is 5643973. The next prime is 5644021. The reversal of 5643990 is 993465.

5643990 is a `hidden beast` number, since 5 + 643 + 9 + 9 + 0 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1861 + ... + 3840.

It is an arithmetic number, because the mean of its divisors is an integer number (333567).

Almost surely, 2^5643990 is an apocalyptic number.

5643990 is an abundant number, since it is smaller than the sum of its proper divisors (10367226).

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

5643990 is a wasteful number, since it uses less digits than its factorization.

5643990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5725 (or 5722 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 5643990 is about 2375.7083154293. The cubic root of 5643990 is about 178.0445749578.

It can be divided in two parts, 564 and 3990, that added together give a palindrome (4554).

The spelling of 5643990 in words is "five million, six hundred forty-three thousand, nine hundred ninety".