6645724 has 6 divisors (see below), whose sum is σ = 11630024. Its totient is φ = 3322860.

The previous prime is 6645721. The next prime is 6645739. The reversal of 6645724 is 4275466.

It is a self number, because there is not a number n which added to its sum of digits gives 6645724.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830712 + ... + 830719.

Almost surely, 2^6645724 is an apocalyptic number.

It is an amenable number.

6645724 is a deficient number, since it is larger than the sum of its proper divisors (4984300).

6645724 is a wasteful number, since it uses less digits than its factorization.

6645724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661435 (or 1661433 counting only the distinct ones).

The product of its digits is 40320, while the sum is 34.

The square root of 6645724 is about 2577.9301774874. The cubic root of 6645724 is about 188.0099210096.

The spelling of 6645724 in words is "six million, six hundred forty-five thousand, seven hundred twenty-four".