6640732 has 18 divisors (see below), whose sum is σ = 13308792. Its totient is φ = 2840184.

The previous prime is 6640687. The next prime is 6640757. The reversal of 6640732 is 2370466.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 6640732.

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 in 5 ways as a sum of consecutive naturals, for example, 13393 + ... + 13879.

Almost surely, 2^6640732 is an apocalyptic number.

It is an amenable number.

6640732 is an abundant number, since it is smaller than the sum of its proper divisors (6668060).

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

6640732 is an equidigital number, since it uses as much as digits as its factorization.

6640732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985 (or 496 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 6640732 is about 2576.9617769769. The cubic root of 6640732 is about 187.9628340595.

Multiplying 6640732 by its sum of digits (28), we get a square (185940496 = 13636²).

6640732 divided by its sum of digits (28) gives a square (237169 = 487²).

The spelling of 6640732 in words is "six million, six hundred forty thousand, seven hundred thirty-two".