25625721 has 16 divisors (see below), whose sum is σ = 38142720. Its totient is φ = 15168720.

The previous prime is 25625711. The next prime is 25625753. The reversal of 25625721 is 12752652.

It is not a de Polignac number, because 25625721 - 2¹¹ = 25623673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25625711) 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 15 ways as a sum of consecutive naturals, for example, 7611 + ... + 10448.

It is an arithmetic number, because the mean of its divisors is an integer number (2383920).

Almost surely, 2^25625721 is an apocalyptic number.

It is an amenable number.

25625721 is a deficient number, since it is larger than the sum of its proper divisors (12516999).

25625721 is a wasteful number, since it uses less digits than its factorization.

25625721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18116.

The product of its digits is 8400, while the sum is 30.

The square root of 25625721 is about 5062.1853976321. The cubic root of 25625721 is about 294.8211920339.

The spelling of 25625721 in words is "twenty-five million, six hundred twenty-five thousand, seven hundred twenty-one".