6657687 has 16 divisors (see below), whose sum is σ = 9922560. Its totient is φ = 4411800.

The previous prime is 6657671. The next prime is 6657697. The reversal of 6657687 is 7867566.

It is not a de Polignac number, because 6657687 - 2⁴ = 6657671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6657667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4512 + ... + 5802.

It is an arithmetic number, because the mean of its divisors is an integer number (620160).

Almost surely, 2^6657687 is an apocalyptic number.

6657687 is a deficient number, since it is larger than the sum of its proper divisors (3264873).

6657687 is a wasteful number, since it uses less digits than its factorization.

6657687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1491 (or 1485 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 6657687 is about 2580.2494065497. The cubic root of 6657687 is about 188.1226659092.

The spelling of 6657687 in words is "six million, six hundred fifty-seven thousand, six hundred eighty-seven".