25326721 has 16 divisors (see below), whose sum is σ = 30146560. Its totient is φ = 20820240.

The previous prime is 25326701. The next prime is 25326727. The reversal of 25326721 is 12762352.

It is a de Polignac number, because none of the positive numbers 2^k-25326721 is a prime.

It is a super-2 number, since 2×25326721² = 1282885593223682, which contains 22 as substring.

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 25326721.

It is not an unprimeable number, because it can be changed into a prime (25326727) 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, 27100 + ... + 28018.

It is an arithmetic number, because the mean of its divisors is an integer number (1884160).

Almost surely, 2^25326721 is an apocalyptic number.

It is an amenable number.

25326721 is a deficient number, since it is larger than the sum of its proper divisors (4819839).

25326721 is a wasteful number, since it uses less digits than its factorization.

25326721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084.

The product of its digits is 5040, while the sum is 28.

The square root of 25326721 is about 5032.5660452696. The cubic root of 25326721 is about 293.6700488011.

The spelling of 25326721 in words is "twenty-five million, three hundred twenty-six thousand, seven hundred twenty-one".