6657220 has 24 divisors (see below), whose sum is σ = 14716800. Its totient is φ = 2522592.

The previous prime is 6657193. The next prime is 6657223. The reversal of 6657220 is 227566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6657223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8380 + ... + 9139.

It is an arithmetic number, because the mean of its divisors is an integer number (613200).

Almost surely, 2^6657220 is an apocalyptic number.

It is an amenable number.

6657220 is an abundant number, since it is smaller than the sum of its proper divisors (8059580).

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

6657220 is a wasteful number, since it uses less digits than its factorization.

6657220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17547 (or 17545 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 6657220 is about 2580.1589098348. The cubic root of 6657220 is about 188.1182672175.

The spelling of 6657220 in words is "six million, six hundred fifty-seven thousand, two hundred twenty".