1628287 has 4 divisors (see below), whose sum is σ = 1636216. Its totient is φ = 1620360.

The previous prime is 1628279. The next prime is 1628293. The reversal of 1628287 is 7828261.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1628287 - 2³ = 1628279 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 (1628227) 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 3 ways as a sum of consecutive naturals, for example, 3648 + ... + 4069.

It is an arithmetic number, because the mean of its divisors is an integer number (409054).

2^1628287 is an apocalyptic number.

1628287 is a deficient number, since it is larger than the sum of its proper divisors (7929).

1628287 is an equidigital number, since it uses as much as digits as its factorization.

1628287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7928.

The product of its digits is 10752, while the sum is 34.

The square root of 1628287 is about 1276.0434945565. The cubic root of 1628287 is about 117.6459511219.

The spelling of 1628287 in words is "one million, six hundred twenty-eight thousand, two hundred eighty-seven".