26550721 has 4 divisors (see below), whose sum is σ = 27051732. Its totient is φ = 26049712.

The previous prime is 26550701. The next prime is 26550731. The reversal of 26550721 is 12705562.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20976400 + 5574321 = 4580^2 + 2361^2 .

It is not a de Polignac number, because 26550721 - 2¹⁹ = 26026433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26550721.

It is not an unprimeable number, because it can be changed into a prime (26550701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250426 + ... + 250531.

It is an arithmetic number, because the mean of its divisors is an integer number (6762933).

Almost surely, 2^26550721 is an apocalyptic number.

It is an amenable number.

26550721 is a deficient number, since it is larger than the sum of its proper divisors (501011).

26550721 is an equidigital number, since it uses as much as digits as its factorization.

26550721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501010.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 26550721 is about 5152.7391744586. The cubic root of 26550721 is about 298.3266878108.

The spelling of 26550721 in words is "twenty-six million, five hundred fifty thousand, seven hundred twenty-one".