25768641 has 4 divisors (see below), whose sum is σ = 34358192. Its totient is φ = 17179092.

The previous prime is 25768637. The next prime is 25768649. The reversal of 25768641 is 14686752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25768641 - 2² = 25768637 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25768641.

It is not an unprimeable number, because it can be changed into a prime (25768649) 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, 4294771 + ... + 4294776.

It is an arithmetic number, because the mean of its divisors is an integer number (8589548).

Almost surely, 2^25768641 is an apocalyptic number.

It is an amenable number.

25768641 is a deficient number, since it is larger than the sum of its proper divisors (8589551).

25768641 is an equidigital number, since it uses as much as digits as its factorization.

25768641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8589550.

The product of its digits is 80640, while the sum is 39.

The square root of 25768641 is about 5076.2822025573. The cubic root of 25768641 is about 295.3682693643.

The spelling of 25768641 in words is "twenty-five million, seven hundred sixty-eight thousand, six hundred forty-one".