1628709975689 has 4 divisors (see below), whose sum is σ = 1629832451280. Its totient is φ = 1627587500100.

The previous prime is 1628709975679. The next prime is 1628709975707. The reversal of 1628709975689 is 9865799078261.

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 1628709975689 - 2³⁶ = 1559990498953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1628709975679) 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, 561235619 + ... + 561238520.

It is an arithmetic number, because the mean of its divisors is an integer number (407458112820).

Almost surely, 2^{1628709975689} is an apocalyptic number.

It is an amenable number.

1628709975689 is a deficient number, since it is larger than the sum of its proper divisors (1122475591).

1628709975689 is a wasteful number, since it uses less digits than its factorization.

1628709975689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122475590.

The product of its (nonzero) digits is 823011840, while the sum is 77.

The spelling of 1628709975689 in words is "one trillion, six hundred twenty-eight billion, seven hundred nine million, nine hundred seventy-five thousand, six hundred eighty-nine".