26428559 has 4 divisors (see below), whose sum is σ = 27073200. Its totient is φ = 25783920.

The previous prime is 26428513. The next prime is 26428583. The reversal of 26428559 is 95582462.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26428559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 644599 = 26428559 / (2 + 6 + 4 + 2 + 8 + 5 + 5 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26428159) 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, 322259 + ... + 322340.

It is an arithmetic number, because the mean of its divisors is an integer number (6768300).

Almost surely, 2^26428559 is an apocalyptic number.

26428559 is a deficient number, since it is larger than the sum of its proper divisors (644641).

26428559 is an equidigital number, since it uses as much as digits as its factorization.

26428559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644640.

The product of its digits is 172800, while the sum is 41.

The square root of 26428559 is about 5140.8714241848. The cubic root of 26428559 is about 297.8684425983.

The spelling of 26428559 in words is "twenty-six million, four hundred twenty-eight thousand, five hundred fifty-nine".