1668628 has 12 divisors (see below), whose sum is σ = 3144820. Its totient is φ = 770112.

The previous prime is 1668619. The next prime is 1668629. The reversal of 1668628 is 8268661.

It can be written as a sum of positive squares in 2 ways, for example, as 101124 + 1567504 = 318^2 + 1252^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668629) 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, 15993 + ... + 16096.

2^1668628 is an apocalyptic number.

It is an amenable number.

1668628 is a deficient number, since it is larger than the sum of its proper divisors (1476192).

1668628 is a wasteful number, since it uses less digits than its factorization.

1668628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32106 (or 32104 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The square root of 1668628 is about 1291.7538465203. The cubic root of 1668628 is about 118.6096002739.

It can be divided in two parts, 16 and 68628, that added together give a square (68644 = 262²).

The spelling of 1668628 in words is "one million, six hundred sixty-eight thousand, six hundred twenty-eight".