1628225 has 6 divisors (see below), whose sum is σ = 2019030. Its totient is φ = 1302560.

The previous prime is 1628203. The next prime is 1628227. The reversal of 1628225 is 5228261.

It can be written as a sum of positive squares in 3 ways, for example, as 49 + 1628176 = 7^2 + 1276^2 .

It is not a de Polignac number, because 1628225 - 2⁶ = 1628161 is a prime.

It is a super-2 number, since 2×1628225² = 5302233301250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1628194 and 1628203.

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

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32540 + ... + 32589.

It is an arithmetic number, because the mean of its divisors is an integer number (336505).

2^1628225 is an apocalyptic number.

It is an amenable number.

1628225 is a deficient number, since it is larger than the sum of its proper divisors (390805).

1628225 is an equidigital number, since it uses as much as digits as its factorization.

1628225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65139 (or 65134 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

The square root of 1628225 is about 1276.0192004825. The cubic root of 1628225 is about 117.6444579082.

The spelling of 1628225 in words is "one million, six hundred twenty-eight thousand, two hundred twenty-five".