26610721 has 2 divisors, whose sum is σ = 26610722. Its totient is φ = 26610720.

The previous prime is 26610673. The next prime is 26610737. The reversal of 26610721 is 12701662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21022225 + 5588496 = 4585^2 + 2364^2 .

It is a cyclic number.

It is not a de Polignac number, because 26610721 - 2¹³ = 26602529 is a prime.

It is not a weakly prime, because it can be changed into another prime (26610751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13305360 + 13305361.

It is an arithmetic number, because the mean of its divisors is an integer number (13305361).

Almost surely, 2^26610721 is an apocalyptic number.

It is an amenable number.

26610721 is a deficient number, since it is larger than the sum of its proper divisors (1).

26610721 is an equidigital number, since it uses as much as digits as its factorization.

26610721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 26610721 is about 5158.5580349551. The cubic root of 26610721 is about 298.5512408445.

The spelling of 26610721 in words is "twenty-six million, six hundred ten thousand, seven hundred twenty-one".