1628665 has 8 divisors (see below), whose sum is σ = 1963008. Its totient is φ = 1297200.

The previous prime is 1628633. The next prime is 1628689. The reversal of 1628665 is 5668261.

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

It is not a de Polignac number, because 1628665 - 2⁵ = 1628633 is a prime.

It is a Duffinian number.

1628665 is a lucky number.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 1628665.

It is an unprimeable number.

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, 840 + ... + 1990.

It is an arithmetic number, because the mean of its divisors is an integer number (245376).

2^1628665 is an apocalyptic number.

It is an amenable number.

1628665 is a deficient number, since it is larger than the sum of its proper divisors (334343).

1628665 is a wasteful number, since it uses less digits than its factorization.

1628665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1439.

The product of its digits is 17280, while the sum is 34.

The square root of 1628665 is about 1276.1916000350. The cubic root of 1628665 is about 117.6550540890.

The spelling of 1628665 in words is "one million, six hundred twenty-eight thousand, six hundred sixty-five".