26920528209 has 24 divisors (see below), whose sum is σ = 39988762632. Its totient is φ = 17441095680.

The previous prime is 26920528171. The next prime is 26920528213. The reversal of 26920528209 is 90282502962.

It can be written as a sum of positive squares in 4 ways, for example, as 5412839184 + 21507689025 = 73572^2 + 146655^2 .

It is a de Polignac number, because none of the positive numbers 2^k-26920528209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26920528289) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47104 + ... + 236769.

It is an arithmetic number, because the mean of its divisors is an integer number (1666198443).

Almost surely, 2^26920528209 is an apocalyptic number.

It is an amenable number.

26920528209 is a deficient number, since it is larger than the sum of its proper divisors (13068234423).

26920528209 is a wasteful number, since it uses less digits than its factorization.

26920528209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284177 (or 284174 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 26920528209 in words is "twenty-six billion, nine hundred twenty million, five hundred twenty-eight thousand, two hundred nine".