25728103 has 4 divisors (see below), whose sum is σ = 25767688. Its totient is φ = 25688520.

The previous prime is 25728077. The next prime is 25728107. The reversal of 25728103 is 30182752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25728103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25728107) 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 3 ways as a sum of consecutive naturals, for example, 18801 + ... + 20122.

It is an arithmetic number, because the mean of its divisors is an integer number (6441922).

Almost surely, 2^25728103 is an apocalyptic number.

25728103 is a deficient number, since it is larger than the sum of its proper divisors (39585).

25728103 is an equidigital number, since it uses as much as digits as its factorization.

25728103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39584.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 25728103 is about 5072.2877481468. The cubic root of 25728103 is about 295.2133016372.

The spelling of 25728103 in words is "twenty-five million, seven hundred twenty-eight thousand, one hundred three".