6657680 has 20 divisors (see below), whose sum is σ = 15479292. Its totient is φ = 2663040.

The previous prime is 6657671. The next prime is 6657697. The reversal of 6657680 is 867566.

It can be written as a sum of positive squares in 2 ways, for example, as 2768896 + 3888784 = 1664^2 + 1972^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41531 + ... + 41690.

Almost surely, 2^6657680 is an apocalyptic number.

It is an amenable number.

6657680 is an abundant number, since it is smaller than the sum of its proper divisors (8821612).

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

6657680 is a wasteful number, since it uses less digits than its factorization.

6657680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83234 (or 83228 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 6657680 is about 2580.2480500913. The cubic root of 6657680 is about 188.1225999775.

It can be divided in two parts, 6657 and 680, that added together give a palindrome (7337).

The spelling of 6657680 in words is "six million, six hundred fifty-seven thousand, six hundred eighty".