1666628 has 12 divisors (see below), whose sum is σ = 2995692. Its totient is φ = 810720.

The previous prime is 1666627. The next prime is 1666657. The reversal of 1666628 is 8266661.

It can be written as a sum of positive squares in 2 ways, for example, as 1592644 + 73984 = 1262^2 + 272^2 .

It is not an unprimeable number, because it can be changed into a prime (1666627) 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, 5483 + ... + 5778.

It is an arithmetic number, because the mean of its divisors is an integer number (249641).

2^1666628 is an apocalyptic number.

It is an amenable number.

1666628 is a deficient number, since it is larger than the sum of its proper divisors (1329064).

1666628 is a wasteful number, since it uses less digits than its factorization.

1666628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11302 (or 11300 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 1666628 is about 1290.9794731133. The cubic root of 1666628 is about 118.5621932545.

The spelling of 1666628 in words is "one million, six hundred sixty-six thousand, six hundred twenty-eight".