2628305689 has 4 divisors (see below), whose sum is σ = 2782911924. Its totient is φ = 2473699456.

The previous prime is 2628305683. The next prime is 2628305717. The reversal of 2628305689 is 9865038262.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9865038262 = 2 ⋅4932519131.

It can be written as a sum of positive squares in 2 ways, for example, as 2047110025 + 581195664 = 45245^2 + 24108^2 .

It is a cyclic number.

It is not a de Polignac number, because 2628305689 - 2¹¹ = 2628303641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2628305683) 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, 77303092 + ... + 77303125.

It is an arithmetic number, because the mean of its divisors is an integer number (695727981).

Almost surely, 2^2628305689 is an apocalyptic number.

It is an amenable number.

2628305689 is a deficient number, since it is larger than the sum of its proper divisors (154606235).

2628305689 is a wasteful number, since it uses less digits than its factorization.

2628305689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154606234.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The square root of 2628305689 is about 51267.0039011448. The cubic root of 2628305689 is about 1380.0409021343.

The spelling of 2628305689 in words is "two billion, six hundred twenty-eight million, three hundred five thousand, six hundred eighty-nine".