25778447 has 4 divisors (see below), whose sum is σ = 25849056. Its totient is φ = 25707840.

The previous prime is 25778413. The next prime is 25778449. The reversal of 25778447 is 74487752.

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

It is a cyclic number.

It is not a de Polignac number, because 25778447 - 2⁸ = 25778191 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25778398 and 25778407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25778449) 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, 34754 + ... + 35487.

It is an arithmetic number, because the mean of its divisors is an integer number (6462264).

Almost surely, 2^25778447 is an apocalyptic number.

25778447 is a deficient number, since it is larger than the sum of its proper divisors (70609).

25778447 is an equidigital number, since it uses as much as digits as its factorization.

25778447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70608.

The product of its digits is 439040, while the sum is 44.

The square root of 25778447 is about 5077.2479750353. The cubic root of 25778447 is about 295.4057310984.

The spelling of 25778447 in words is "twenty-five million, seven hundred seventy-eight thousand, four hundred forty-seven".