6640590 has 32 divisors (see below), whose sum is σ = 17387136. Its totient is φ = 1609760.

The previous prime is 6640589. The next prime is 6640597. The reversal of 6640590 is 950466.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640597) 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, 9732 + ... + 10391.

It is an arithmetic number, because the mean of its divisors is an integer number (543348).

Almost surely, 2^6640590 is an apocalyptic number.

6640590 is an abundant number, since it is smaller than the sum of its proper divisors (10746546).

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

6640590 is a wasteful number, since it uses less digits than its factorization.

6640590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20144.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 6640590 is about 2576.9342250046. The cubic root of 6640590 is about 187.9614943019.

The spelling of 6640590 in words is "six million, six hundred forty thousand, five hundred ninety".