25728487 has 2 divisors, whose sum is σ = 25728488. Its totient is φ = 25728486.

The previous prime is 25728457. The next prime is 25728523. The reversal of 25728487 is 78482752.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25728487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25728457) 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 as a sum of consecutive naturals, namely, 12864243 + 12864244.

It is an arithmetic number, because the mean of its divisors is an integer number (12864244).

Almost surely, 2^25728487 is an apocalyptic number.

25728487 is a deficient number, since it is larger than the sum of its proper divisors (1).

25728487 is an equidigital number, since it uses as much as digits as its factorization.

25728487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 250880, while the sum is 43.

The square root of 25728487 is about 5072.3256007476. The cubic root of 25728487 is about 295.2147703469.

The spelling of 25728487 in words is "twenty-five million, seven hundred twenty-eight thousand, four hundred eighty-seven".