26805649 has 16 divisors (see below), whose sum is σ = 30949632. Its totient is φ = 23018688.

The previous prime is 26805631. The next prime is 26805661. The reversal of 26805649 is 94650862.

It is a happy number.

26805649 is nontrivially palindromic in base 14.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26805649 is a prime.

It is a super-4 number, since 4×26805649⁴ (a number of 31 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26805619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9852 + ... + 12274.

It is an arithmetic number, because the mean of its divisors is an integer number (1934352).

Almost surely, 2^26805649 is an apocalyptic number.

It is an amenable number.

26805649 is a deficient number, since it is larger than the sum of its proper divisors (4143983).

26805649 is a wasteful number, since it uses less digits than its factorization.

26805649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2496.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 26805649 is about 5177.4172132445. The cubic root of 26805649 is about 299.2784474124.

The spelling of 26805649 in words is "twenty-six million, eight hundred five thousand, six hundred forty-nine".