25728137 has 2 divisors, whose sum is σ = 25728138. Its totient is φ = 25728136.

The previous prime is 25728119. The next prime is 25728139. The reversal of 25728137 is 73182752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16613776 + 9114361 = 4076^2 + 3019^2 .

It is a cyclic number.

It is not a de Polignac number, because 25728137 - 2¹⁰ = 25727113 is a prime.

Together with 25728139, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 25728097 and 25728106.

It is not a weakly prime, because it can be changed into another prime (25728139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12864068 + 12864069.

It is an arithmetic number, because the mean of its divisors is an integer number (12864069).

Almost surely, 2^25728137 is an apocalyptic number.

It is an amenable number.

25728137 is a deficient number, since it is larger than the sum of its proper divisors (1).

25728137 is an equidigital number, since it uses as much as digits as its factorization.

25728137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23520, while the sum is 35.

The square root of 25728137 is about 5072.2910996906. The cubic root of 25728137 is about 295.2134316798.

The spelling of 25728137 in words is "twenty-five million, seven hundred twenty-eight thousand, one hundred thirty-seven".