26820613 has 2 divisors, whose sum is σ = 26820614. Its totient is φ = 26820612.

The previous prime is 26820593. The next prime is 26820653. The reversal of 26820613 is 31602862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24137569 + 2683044 = 4913^2 + 1638^2 .

It is a cyclic number.

It is not a de Polignac number, because 26820613 - 2¹³ = 26812421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26820653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13410306 + 13410307.

It is an arithmetic number, because the mean of its divisors is an integer number (13410307).

Almost surely, 2^26820613 is an apocalyptic number.

It is an amenable number.

26820613 is a deficient number, since it is larger than the sum of its proper divisors (1).

26820613 is an equidigital number, since it uses as much as digits as its factorization.

26820613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 26820613 is about 5178.8621337124. The cubic root of 26820613 is about 299.3341268403.

The spelling of 26820613 in words is "twenty-six million, eight hundred twenty thousand, six hundred thirteen".