1628224 has 56 divisors (see below), whose sum is σ = 3698240. Its totient is φ = 705024.

The previous prime is 1628203. The next prime is 1628227. The reversal of 1628224 is 4228261.

It is a happy number.

It is a super-2 number, since 2×1628224² = 5302226788352, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1628227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15757 + ... + 15859.

It is an arithmetic number, because the mean of its divisors is an integer number (66040).

2^1628224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1628224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1849120).

1628224 is an abundant number, since it is smaller than the sum of its proper divisors (2070016).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1628224 is a wasteful number, since it uses less digits than its factorization.

1628224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147 (or 137 counting only the distinct ones).

The product of its digits is 1536, while the sum is 25.

The square root of 1628224 is about 1276.0188086388. The cubic root of 1628224 is about 117.6444338238.

It can be divided in two parts, 16 and 28224, that multiplied together give a square (451584 = 672²).

The spelling of 1628224 in words is "one million, six hundred twenty-eight thousand, two hundred twenty-four".