25320547 has 4 divisors (see below), whose sum is σ = 28937776. Its totient is φ = 21703320.

The previous prime is 25320481. The next prime is 25320553. The reversal of 25320547 is 74502352.

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 25320547 - 2¹⁹ = 24796259 is a prime.

It is a super-2 number, since 2×25320547² = 1282260200758418, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25320577) 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, 1808604 + ... + 1808617.

It is an arithmetic number, because the mean of its divisors is an integer number (7234444).

Almost surely, 2^25320547 is an apocalyptic number.

25320547 is a deficient number, since it is larger than the sum of its proper divisors (3617229).

25320547 is an equidigital number, since it uses as much as digits as its factorization.

25320547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3617228.

The product of its (nonzero) digits is 8400, while the sum is 28.

The square root of 25320547 is about 5031.9526031154. The cubic root of 25320547 is about 293.6461838059.

Adding to 25320547 its reverse (74502352), we get a palindrome (99822899).

The spelling of 25320547 in words is "twenty-five million, three hundred twenty thousand, five hundred forty-seven".