6656820 has 24 divisors (see below), whose sum is σ = 18639264. Its totient is φ = 1775136.

The previous prime is 6656807. The next prime is 6656833. The reversal of 6656820 is 286566.

It is an interprime number because it is at equal distance from previous prime (6656807) and next prime (6656833).

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 7 ways as a sum of consecutive naturals, for example, 55414 + ... + 55533.

It is an arithmetic number, because the mean of its divisors is an integer number (776636).

Almost surely, 2^6656820 is an apocalyptic number.

6656820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6656820 is an abundant number, since it is smaller than the sum of its proper divisors (11982444).

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

6656820 is a wasteful number, since it uses less digits than its factorization.

6656820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110959 (or 110957 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 6656820 is about 2580.0813940649. The cubic root of 6656820 is about 188.1144994378.

The spelling of 6656820 in words is "six million, six hundred fifty-six thousand, eight hundred twenty".