6649623 has 6 divisors (see below), whose sum is σ = 9605024. Its totient is φ = 4433076.

The previous prime is 6649609. The next prime is 6649627. The reversal of 6649623 is 3269466.

6649623 is a `hidden beast` number, since 6 + 649 + 6 + 2 + 3 = 666.

It is not a de Polignac number, because 6649623 - 2⁸ = 6649367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6649627) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 369415 + ... + 369432.

Almost surely, 2^6649623 is an apocalyptic number.

6649623 is a deficient number, since it is larger than the sum of its proper divisors (2955401).

6649623 is a wasteful number, since it uses less digits than its factorization.

6649623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738853 (or 738850 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 6649623 is about 2578.6862934448. The cubic root of 6649623 is about 188.0466818586.

The spelling of 6649623 in words is "six million, six hundred forty-nine thousand, six hundred twenty-three".