26001649 has 4 divisors (see below), whose sum is σ = 26015220. Its totient is φ = 25988080.

The previous prime is 26001631. The next prime is 26001673. The reversal of 26001649 is 94610062.

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 24324624 + 1677025 = 4932^2 + 1295^2 .

It is a cyclic number.

It is not a de Polignac number, because 26001649 - 2¹⁷ = 25870577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26002649) 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, 3322 + ... + 7939.

It is an arithmetic number, because the mean of its divisors is an integer number (6503805).

Almost surely, 2^26001649 is an apocalyptic number.

It is an amenable number.

26001649 is a deficient number, since it is larger than the sum of its proper divisors (13571).

26001649 is a wasteful number, since it uses less digits than its factorization.

26001649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13570.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 26001649 is about 5099.1812087824. The cubic root of 26001649 is about 296.2558697289.

The spelling of 26001649 in words is "twenty-six million, one thousand, six hundred forty-nine".