1628786444 has 24 divisors (see below), whose sum is σ = 2871648528. Its totient is φ = 808335360.

The previous prime is 1628786443. The next prime is 1628786449. The reversal of 1628786444 is 4446878261.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1628786392 and 1628786401.

It is not an unprimeable number, because it can be changed into a prime (1628786441) 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, 376904 + ... + 381200.

It is an arithmetic number, because the mean of its divisors is an integer number (119652022).

Almost surely, 2^1628786444 is an apocalyptic number.

It is an amenable number.

1628786444 is a deficient number, since it is larger than the sum of its proper divisors (1242862084).

1628786444 is a wasteful number, since it uses less digits than its factorization.

1628786444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4985 (or 4983 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 50.

The square root of 1628786444 is about 40358.2264724306. The cubic root of 1628786444 is about 1176.5797839514.

The spelling of 1628786444 in words is "one billion, six hundred twenty-eight million, seven hundred eighty-six thousand, four hundred forty-four".