6621128 has 16 divisors (see below), whose sum is σ = 12480000. Its totient is φ = 3293136.

The previous prime is 6621127. The next prime is 6621137. The reversal of 6621128 is 8211266.

It is a junction number, because it is equal to n+sod(n) for n = 6621097 and 6621106.

It is not an unprimeable number, because it can be changed into a prime (6621127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 488 + ... + 3671.

It is an arithmetic number, because the mean of its divisors is an integer number (780000).

Almost surely, 2^6621128 is an apocalyptic number.

It is an amenable number.

6621128 is a deficient number, since it is larger than the sum of its proper divisors (5858872).

6621128 is a wasteful number, since it uses less digits than its factorization.

6621128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4364 (or 4360 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

The square root of 6621128 is about 2573.1552615418. The cubic root of 6621128 is about 187.7776910498. Note that the first 3 decimals are identical.

The spelling of 6621128 in words is "six million, six hundred twenty-one thousand, one hundred twenty-eight".