6623861 has 4 divisors (see below), whose sum is σ = 6852300. Its totient is φ = 6395424.

The previous prime is 6623857. The next prime is 6623873. The reversal of 6623861 is 1683266.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4884100 + 1739761 = 2210^2 + 1319^2 .

It is a cyclic number.

It is not a de Polignac number, because 6623861 - 2² = 6623857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6623891) 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 3 ways as a sum of consecutive naturals, for example, 114176 + ... + 114233.

It is an arithmetic number, because the mean of its divisors is an integer number (1713075).

Almost surely, 2^6623861 is an apocalyptic number.

It is an amenable number.

6623861 is a deficient number, since it is larger than the sum of its proper divisors (228439).

6623861 is a wasteful number, since it uses less digits than its factorization.

6623861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228438.

The product of its digits is 10368, while the sum is 32.

The square root of 6623861 is about 2573.6862668165. The cubic root of 6623861 is about 187.8035237999.

The spelling of 6623861 in words is "six million, six hundred twenty-three thousand, eight hundred sixty-one".