26250721 has 12 divisors (see below), whose sum is σ = 30693360. Its totient is φ = 22385160.

The previous prime is 26250709. The next prime is 26250743. The reversal of 26250721 is 12705262.

It is not a de Polignac number, because 26250721 - 2⁵ = 26250689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26250781) 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 11 ways as a sum of consecutive naturals, for example, 9070 + ... + 11608.

It is an arithmetic number, because the mean of its divisors is an integer number (2557780).

Almost surely, 2^26250721 is an apocalyptic number.

It is an amenable number.

26250721 is a deficient number, since it is larger than the sum of its proper divisors (4442639).

26250721 is a wasteful number, since it uses less digits than its factorization.

26250721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2764 (or 2757 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 26250721 is about 5123.5457448919. The cubic root of 26250721 is about 297.1988186086.

Adding to 26250721 its reverse (12705262), we get a palindrome (38955983).

The spelling of 26250721 in words is "twenty-six million, two hundred fifty thousand, seven hundred twenty-one".