6656740 has 12 divisors (see below), whose sum is σ = 13979196. Its totient is φ = 2662688.

The previous prime is 6656737. The next prime is 6656743. The reversal of 6656740 is 476566.

It is an interprime number because it is at equal distance from previous prime (6656737) and next prime (6656743).

It can be written as a sum of positive squares in 2 ways, for example, as 3587236 + 3069504 = 1894^2 + 1752^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6656696 and 6656705.

It is not an unprimeable number, because it can be changed into a prime (6656743) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 166399 + ... + 166438.

It is an arithmetic number, because the mean of its divisors is an integer number (1164933).

Almost surely, 2^6656740 is an apocalyptic number.

It is an amenable number.

6656740 is an abundant number, since it is smaller than the sum of its proper divisors (7322456).

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

6656740 is a wasteful number, since it uses less digits than its factorization.

6656740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332846 (or 332844 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 6656740 is about 2580.0658906315. The cubic root of 6656740 is about 188.1137458638.

It can be divided in two parts, 6656 and 740, that added together give a square (7396 = 86²).

The spelling of 6656740 in words is "six million, six hundred fifty-six thousand, seven hundred forty".