26389027809 has 27 divisors (see below), whose sum is σ = 38461970937. Its totient is φ = 17435111616.

The previous prime is 26389027799. The next prime is 26389027837. The reversal of 26389027809 is 90872098362.

It is a happy number.

The square root of 26389027809 is 162447.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1317472209 + 25071555600 = 36297^2 + 158340^2 .

It is not a de Polignac number, because 26389027809 - 2¹⁵ = 26388995041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26389027009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 84309837 + ... + 84310149.

Almost surely, 2^26389027809 is an apocalyptic number.

26389027809 is the 162447-th square number.

26389027809 is the 81224-th centered octagonal number.

It is an amenable number.

26389027809 is a deficient number, since it is larger than the sum of its proper divisors (12072943128).

26389027809 is an frugal number, since it uses more digits than its factorization.

26389027809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 26389027809 in words is "twenty-six billion, three hundred eighty-nine million, twenty-seven thousand, eight hundred nine".