6228781 has 4 divisors (see below), whose sum is σ = 6707932. Its totient is φ = 5749632.

The previous prime is 6228779. The next prime is 6228787. The reversal of 6228781 is 1878226.

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 3222025 + 3006756 = 1795^2 + 1734^2 .

It is a cyclic number.

It is not a de Polignac number, because 6228781 - 2¹ = 6228779 is a prime.

It is a super-2 number, since 2×6228781² = 77595425491922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6228787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239556 + ... + 239581.

It is an arithmetic number, because the mean of its divisors is an integer number (1676983).

Almost surely, 2^6228781 is an apocalyptic number.

It is an amenable number.

6228781 is a deficient number, since it is larger than the sum of its proper divisors (479151).

6228781 is a wasteful number, since it uses less digits than its factorization.

6228781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479150.

The product of its digits is 10752, while the sum is 34.

The square root of 6228781 is about 2495.7525919049. The cubic root of 6228781 is about 183.9928813409.

The spelling of 6228781 in words is "six million, two hundred twenty-eight thousand, seven hundred eighty-one".