26128613 has 6 divisors (see below), whose sum is σ = 30394566. Its totient is φ = 22395912.

The previous prime is 26128601. The next prime is 26128631. The reversal of 26128613 is 31682162.

It can be written as a sum of positive squares in only one way, i.e., 22259524 + 3869089 = 4718^2 + 1967^2 .

It is not a de Polignac number, because 26128613 - 2¹² = 26124517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26128693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 266570 + ... + 266667.

It is an arithmetic number, because the mean of its divisors is an integer number (5065761).

Almost surely, 2^26128613 is an apocalyptic number.

It is an amenable number.

26128613 is a deficient number, since it is larger than the sum of its proper divisors (4265953).

26128613 is an equidigital number, since it uses as much as digits as its factorization.

26128613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533251 (or 533244 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 26128613 is about 5111.6154980593. The cubic root of 26128613 is about 296.7372850165.

The spelling of 26128613 in words is "twenty-six million, one hundred twenty-eight thousand, six hundred thirteen".