6221128 has 8 divisors (see below), whose sum is σ = 11664630. Its totient is φ = 3110560.

The previous prime is 6221123. The next prime is 6221147. The reversal of 6221128 is 8211226.

It can be written as a sum of positive squares in only one way, i.e., 5484964 + 736164 = 2342^2 + 858^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 6221099 and 6221108.

It is not an unprimeable number, because it can be changed into a prime (6221123) 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 as a sum of consecutive naturals, namely, 388813 + ... + 388828.

Almost surely, 2^6221128 is an apocalyptic number.

It is an amenable number.

6221128 is a deficient number, since it is larger than the sum of its proper divisors (5443502).

6221128 is a wasteful number, since it uses less digits than its factorization.

6221128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777647 (or 777643 counting only the distinct ones).

The product of its digits is 384, while the sum is 22.

The square root of 6221128 is about 2494.2189158131. The cubic root of 6221128 is about 183.9174960928.

The spelling of 6221128 in words is "six million, two hundred twenty-one thousand, one hundred twenty-eight".