25680449 has 4 divisors (see below), whose sum is σ = 25989936. Its totient is φ = 25370964.

The previous prime is 25680427. The next prime is 25680469. The reversal of 25680449 is 94408652.

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 a cyclic number.

It is not a de Polignac number, because 25680449 - 2²⁴ = 8903233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25680469) 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, 154619 + ... + 154784.

It is an arithmetic number, because the mean of its divisors is an integer number (6497484).

Almost surely, 2^25680449 is an apocalyptic number.

It is an amenable number.

25680449 is a deficient number, since it is larger than the sum of its proper divisors (309487).

25680449 is an equidigital number, since it uses as much as digits as its factorization.

25680449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309486.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 25680449 is about 5067.5880850756. The cubic root of 25680449 is about 295.0309227376.

The spelling of 25680449 in words is "twenty-five million, six hundred eighty thousand, four hundred forty-nine".