6660624 has 20 divisors (see below), whose sum is σ = 17206736. Its totient is φ = 2220192.

The previous prime is 6660613. The next prime is 6660649. The reversal of 6660624 is 4260666.

It is a junction number, because it is equal to n+sod(n) for n = 6660591 and 6660600.

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, 69334 + ... + 69429.

Almost surely, 2^6660624 is an apocalyptic number.

It is an amenable number.

6660624 is an abundant number, since it is smaller than the sum of its proper divisors (10546112).

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

6660624 is a wasteful number, since it uses less digits than its factorization.

6660624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138774 (or 138768 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 6660624 is about 2580.8184748254. The cubic root of 6660624 is about 188.1503249167.

The spelling of 6660624 in words is "six million, six hundred sixty thousand, six hundred twenty-four".