26620609 has 4 divisors (see below), whose sum is σ = 26635204. Its totient is φ = 26606016.

The previous prime is 26620571. The next prime is 26620621. The reversal of 26620609 is 90602662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90602662 = 2 ⋅45301331.

It can be written as a sum of positive squares in 2 ways, for example, as 10419984 + 16200625 = 3228^2 + 4025^2 .

It is a cyclic number.

It is not a de Polignac number, because 26620609 - 2⁷ = 26620481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26620639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4092 + ... + 8365.

It is an arithmetic number, because the mean of its divisors is an integer number (6658801).

Almost surely, 2^26620609 is an apocalyptic number.

It is an amenable number.

26620609 is a deficient number, since it is larger than the sum of its proper divisors (14595).

26620609 is a wasteful number, since it uses less digits than its factorization.

26620609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14594.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 26620609 is about 5159.5163533029. The cubic root of 26620609 is about 298.5882147782.

The spelling of 26620609 in words is "twenty-six million, six hundred twenty thousand, six hundred nine".