26648257 has 4 divisors (see below), whose sum is σ = 26675136. Its totient is φ = 26621380.

The previous prime is 26648233. The next prime is 26648273. The reversal of 26648257 is 75284662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75284662 = 2 ⋅37642331.

It is a cyclic number.

It is not a de Polignac number, because 26648257 - 2¹⁹ = 26123969 is a prime.

It is a super-2 number, since 2×26648257² = 1420259202276098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26648287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11893 + ... + 13954.

It is an arithmetic number, because the mean of its divisors is an integer number (6668784).

Almost surely, 2^26648257 is an apocalyptic number.

It is an amenable number.

26648257 is a deficient number, since it is larger than the sum of its proper divisors (26879).

26648257 is a wasteful number, since it uses less digits than its factorization.

26648257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26878.

The product of its digits is 161280, while the sum is 40.

The square root of 26648257 is about 5162.1949788825. The cubic root of 26648257 is about 298.6915496371.

The spelling of 26648257 in words is "twenty-six million, six hundred forty-eight thousand, two hundred fifty-seven".