26780149 has 4 divisors (see below), whose sum is σ = 29214720. Its totient is φ = 24345580.

The previous prime is 26780129. The next prime is 26780153. The reversal of 26780149 is 94108762.

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.

It is a cyclic number.

It is not a de Polignac number, because 26780149 - 2⁹ = 26779637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26780129) 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, 1217269 + ... + 1217290.

It is an arithmetic number, because the mean of its divisors is an integer number (7303680).

Almost surely, 2^26780149 is an apocalyptic number.

It is an amenable number.

26780149 is a deficient number, since it is larger than the sum of its proper divisors (2434571).

26780149 is a wasteful number, since it uses less digits than its factorization.

26780149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2434570.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 26780149 is about 5174.9540094575. The cubic root of 26780149 is about 299.1835169042.

The spelling of 26780149 in words is "twenty-six million, seven hundred eighty thousand, one hundred forty-nine".