6657644 has 24 divisors (see below), whose sum is σ = 13601280. Its totient is φ = 2792016.

The previous prime is 6657631. The next prime is 6657661. The reversal of 6657644 is 4467566.

It is a junction number, because it is equal to n+sod(n) for n = 6657598 and 6657607.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1214 + ... + 3845.

It is an arithmetic number, because the mean of its divisors is an integer number (566720).

Almost surely, 2^6657644 is an apocalyptic number.

It is an amenable number.

6657644 is an abundant number, since it is smaller than the sum of its proper divisors (6943636).

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

6657644 is a wasteful number, since it uses less digits than its factorization.

6657644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5117 (or 5115 counting only the distinct ones).

The product of its digits is 120960, while the sum is 38.

The square root of 6657644 is about 2580.2410740084. The cubic root of 6657644 is about 188.1222608991.

The spelling of 6657644 in words is "six million, six hundred fifty-seven thousand, six hundred forty-four".