6660636 has 12 divisors (see below), whose sum is σ = 15541512. Its totient is φ = 2220208.

The previous prime is 6660613. The next prime is 6660649. The reversal of 6660636 is 6360666.

It is a tau number, because it is divible by the number of its divisors (12).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6660597 and 6660606.

It is a congruent number.

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, 277515 + ... + 277538.

It is an arithmetic number, because the mean of its divisors is an integer number (1295126).

Almost surely, 2^6660636 is an apocalyptic number.

It is an amenable number.

6660636 is an abundant number, since it is smaller than the sum of its proper divisors (8880876).

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

6660636 is a wasteful number, since it uses less digits than its factorization.

6660636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555060 (or 555058 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 33.

The square root of 6660636 is about 2580.8207996682. The cubic root of 6660636 is about 188.1504379092.

The spelling of 6660636 in words is "six million, six hundred sixty thousand, six hundred thirty-six".