6640532 has 6 divisors (see below), whose sum is σ = 11620938. Its totient is φ = 3320264.

The previous prime is 6640511. The next prime is 6640547. The reversal of 6640532 is 2350466.

It can be written as a sum of positive squares in only one way, i.e., 3556996 + 3083536 = 1886^2 + 1756^2 .

It is a congruent 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 as a sum of consecutive naturals, namely, 830063 + ... + 830070.

It is an arithmetic number, because the mean of its divisors is an integer number (1936823).

Almost surely, 2^6640532 is an apocalyptic number.

It is an amenable number.

6640532 is a deficient number, since it is larger than the sum of its proper divisors (4980406).

6640532 is a wasteful number, since it uses less digits than its factorization.

6640532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660137 (or 1660135 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 6640532 is about 2576.9229712974. The cubic root of 6640532 is about 187.9609470715.

Adding to 6640532 its reverse (2350466), we get a palindrome (8990998).

The spelling of 6640532 in words is "six million, six hundred forty thousand, five hundred thirty-two".