6657988 has 12 divisors (see below), whose sum is σ = 11673900. Its totient is φ = 3322592.

The previous prime is 6657979. The next prime is 6657997. The reversal of 6657988 is 8897566.

It is an interprime number because it is at equal distance from previous prime (6657979) and next prime (6657997).

It can be written as a sum of positive squares in 2 ways, for example, as 4072324 + 2585664 = 2018^2 + 1608^2 .

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, 1338 + ... + 3886.

It is an arithmetic number, because the mean of its divisors is an integer number (972825).

Almost surely, 2^6657988 is an apocalyptic number.

It is an amenable number.

6657988 is a deficient number, since it is larger than the sum of its proper divisors (5015912).

6657988 is a wasteful number, since it uses less digits than its factorization.

6657988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3206 (or 3204 counting only the distinct ones).

The product of its digits is 725760, while the sum is 49.

The square root of 6657988 is about 2580.3077335853. The cubic root of 6657988 is about 188.1255009313.

The spelling of 6657988 in words is "six million, six hundred fifty-seven thousand, nine hundred eighty-eight".