6621967 has 6 divisors (see below), whose sum is σ = 7278824. Its totient is φ = 6019860.

The previous prime is 6621961. The next prime is 6621991. The reversal of 6621967 is 7691266.

It is a de Polignac number, because none of the positive numbers 2^k-6621967 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 (6621961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27243 + ... + 27484.

Almost surely, 2^6621967 is an apocalyptic number.

6621967 is a deficient number, since it is larger than the sum of its proper divisors (656857).

6621967 is a wasteful number, since it uses less digits than its factorization.

6621967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54749 (or 54738 counting only the distinct ones).

The product of its digits is 27216, while the sum is 37.

The square root of 6621967 is about 2573.3182857937. The cubic root of 6621967 is about 187.7856221671.

The spelling of 6621967 in words is "six million, six hundred twenty-one thousand, nine hundred sixty-seven".