2628542809 has 2 divisors, whose sum is σ = 2628542810. Its totient is φ = 2628542808.

The previous prime is 2628542779. The next prime is 2628542843. The reversal of 2628542809 is 9082458262.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1428613209 + 1199929600 = 37797^2 + 34640^2 .

It is a cyclic number.

It is not a de Polignac number, because 2628542809 - 2¹³ = 2628534617 is a prime.

It is a super-2 number, since 2×2628542809² = 13818474597491220962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2628542309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1314271404 + 1314271405.

It is an arithmetic number, because the mean of its divisors is an integer number (1314271405).

Almost surely, 2^2628542809 is an apocalyptic number.

It is an amenable number.

2628542809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2628542809 is an equidigital number, since it uses as much as digits as its factorization.

2628542809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 552960, while the sum is 46.

The square root of 2628542809 is about 51269.3164475595. The cubic root of 2628542809 is about 1380.0824023119.

The spelling of 2628542809 in words is "two billion, six hundred twenty-eight million, five hundred forty-two thousand, eight hundred nine".