25728305 has 4 divisors (see below), whose sum is σ = 30873972. Its totient is φ = 20582640.

The previous prime is 25728301. The next prime is 25728323. The reversal of 25728305 is 50382752.

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 10291264 + 15437041 = 3208^2 + 3929^2 .

It is not a de Polignac number, because 25728305 - 2² = 25728301 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25728301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2572826 + ... + 2572835.

It is an arithmetic number, because the mean of its divisors is an integer number (7718493).

Almost surely, 2^25728305 is an apocalyptic number.

It is an amenable number.

25728305 is a deficient number, since it is larger than the sum of its proper divisors (5145667).

25728305 is an equidigital number, since it uses as much as digits as its factorization.

25728305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5145666.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 25728305 is about 5072.3076602272. The cubic root of 25728305 is about 295.2140742415.

The spelling of 25728305 in words is "twenty-five million, seven hundred twenty-eight thousand, three hundred five".