1628671789 has 4 divisors (see below), whose sum is σ = 1634681920. Its totient is φ = 1622661660.

The previous prime is 1628671747. The next prime is 1628671799. The reversal of 1628671789 is 9871768261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1628671789 - 2⁹ = 1628671277 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 (1628671729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3004659 + ... + 3005200.

It is an arithmetic number, because the mean of its divisors is an integer number (408670480).

Almost surely, 2^1628671789 is an apocalyptic number.

It is an amenable number.

1628671789 is a deficient number, since it is larger than the sum of its proper divisors (6010131).

1628671789 is an equidigital number, since it uses as much as digits as its factorization.

1628671789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6010130.

The product of its digits is 2032128, while the sum is 55.

The square root of 1628671789 is about 40356.8059811477. The cubic root of 1628671789 is about 1176.5521756829.

The spelling of 1628671789 in words is "one billion, six hundred twenty-eight million, six hundred seventy-one thousand, seven hundred eighty-nine".