26797561 has 10 divisors (see below), whose sum is σ = 31264762. Its totient is φ = 22967280.

The previous prime is 26797549. The next prime is 26797571. The reversal of 26797561 is 16579762.

It can be written as a sum of positive squares in only one way, i.e., 15366400 + 11431161 = 3920^2 + 3381^2 .

It is not a de Polignac number, because 26797561 - 2¹¹ = 26795513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26797571) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3180 + ... + 7981.

Almost surely, 2^26797561 is an apocalyptic number.

It is an amenable number.

26797561 is a deficient number, since it is larger than the sum of its proper divisors (4467201).

26797561 is an frugal number, since it uses more digits than its factorization.

26797561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11189 (or 11168 counting only the distinct ones).

The product of its digits is 158760, while the sum is 43.

The square root of 26797561 is about 5176.6360698817. The cubic root of 26797561 is about 299.2483442107.

The spelling of 26797561 in words is "twenty-six million, seven hundred ninety-seven thousand, five hundred sixty-one".