25428447 has 48 divisors (see below), whose sum is σ = 43973280. Its totient is φ = 13977600.

The previous prime is 25428439. The next prime is 25428449. The reversal of 25428447 is 74482452.

It is not a de Polignac number, because 25428447 - 2³ = 25428439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25428449) 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 47 ways as a sum of consecutive naturals, for example, 48547 + ... + 49067.

It is an arithmetic number, because the mean of its divisors is an integer number (916110).

Almost surely, 2^25428447 is an apocalyptic number.

25428447 is a deficient number, since it is larger than the sum of its proper divisors (18544833).

25428447 is a wasteful number, since it uses less digits than its factorization.

25428447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584 (or 581 counting only the distinct ones).

The product of its digits is 71680, while the sum is 36.

The square root of 25428447 is about 5042.6626894925. The cubic root of 25428447 is about 294.0627035493.

The spelling of 25428447 in words is "twenty-five million, four hundred twenty-eight thousand, four hundred forty-seven".