6621456 has 20 divisors (see below), whose sum is σ = 17105552. Its totient is φ = 2207136.

The previous prime is 6621451. The next prime is 6621463. The reversal of 6621456 is 6541266.

It is not an unprimeable number, because it can be changed into a prime (6621451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68926 + ... + 69021.

Almost surely, 2^6621456 is an apocalyptic number.

It is an amenable number.

6621456 is an abundant number, since it is smaller than the sum of its proper divisors (10484096).

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

6621456 is a wasteful number, since it uses less digits than its factorization.

6621456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137958 (or 137952 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 6621456 is about 2573.2189957328. The cubic root of 6621456 is about 187.7807917332.

The spelling of 6621456 in words is "six million, six hundred twenty-one thousand, four hundred fifty-six".