1628638 has 16 divisors (see below), whose sum is σ = 2686320. Its totient is φ = 734400.

The previous prime is 1628633. The next prime is 1628689. The reversal of 1628638 is 8368261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1628633) 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, 3778 + ... + 4186.

It is an arithmetic number, because the mean of its divisors is an integer number (167895).

2^1628638 is an apocalyptic number.

1628638 is a deficient number, since it is larger than the sum of its proper divisors (1057682).

1628638 is a wasteful number, since it uses less digits than its factorization.

1628638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603.

The product of its digits is 13824, while the sum is 34.

The square root of 1628638 is about 1276.1810216423. The cubic root of 1628638 is about 117.6544039238.

The spelling of 1628638 in words is "one million, six hundred twenty-eight thousand, six hundred thirty-eight".