26198057 has 4 divisors (see below), whose sum is σ = 26837076. Its totient is φ = 25559040.

The previous prime is 26198027. The next prime is 26198063. The reversal of 26198057 is 75089162.

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 15202201 + 10995856 = 3899^2 + 3316^2 .

It is a cyclic number.

It is not a de Polignac number, because 26198057 - 2⁶ = 26197993 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 26198057.

It is not an unprimeable number, because it can be changed into a prime (26198027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319448 + ... + 319529.

It is an arithmetic number, because the mean of its divisors is an integer number (6709269).

Almost surely, 2^26198057 is an apocalyptic number.

It is an amenable number.

26198057 is a deficient number, since it is larger than the sum of its proper divisors (639019).

26198057 is an equidigital number, since it uses as much as digits as its factorization.

26198057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639018.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 26198057 is about 5118.4037550783. The cubic root of 26198057 is about 296.9999395375. Note that the first 4 decimals are identical.

The spelling of 26198057 in words is "twenty-six million, one hundred ninety-eight thousand, fifty-seven".