25684745 has 8 divisors (see below), whose sum is σ = 30850440. Its totient is φ = 20528640.

The previous prime is 25684741. The next prime is 25684753. The reversal of 25684745 is 54748652.

It can be written as a sum of positive squares in 4 ways, for example, as 9193024 + 16491721 = 3032^2 + 4061^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25684745 - 2² = 25684741 is a prime.

It is a super-2 number, since 2×25684745² = 1319412251430050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25684741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6521 + ... + 9689.

It is an arithmetic number, because the mean of its divisors is an integer number (3856305).

Almost surely, 2^25684745 is an apocalyptic number.

It is an amenable number.

25684745 is a deficient number, since it is larger than the sum of its proper divisors (5165695).

25684745 is a wasteful number, since it uses less digits than its factorization.

25684745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4795.

The product of its digits is 268800, while the sum is 41.

The square root of 25684745 is about 5068.0119376339. The cubic root of 25684745 is about 295.0473734128.

The spelling of 25684745 in words is "twenty-five million, six hundred eighty-four thousand, seven hundred forty-five".