1628661 has 8 divisors (see below), whose sum is σ = 2285920. Its totient is φ = 1028592.

The previous prime is 1628633. The next prime is 1628689. The reversal of 1628661 is 1668261.

It is an interprime number because it is at equal distance from previous prime (1628633) and next prime (1628689).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1628661 - 2⁹ = 1628149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1628621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14230 + ... + 14343.

It is an arithmetic number, because the mean of its divisors is an integer number (285740).

2^1628661 is an apocalyptic number.

It is an amenable number.

1628661 is a deficient number, since it is larger than the sum of its proper divisors (657259).

1628661 is a wasteful number, since it uses less digits than its factorization.

1628661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28595.

The product of its digits is 3456, while the sum is 30.

The square root of 1628661 is about 1276.1900328713. The cubic root of 1628661 is about 117.6549577687.

The spelling of 1628661 in words is "one million, six hundred twenty-eight thousand, six hundred sixty-one".