25428 has 24 divisors (see below), whose sum is σ = 64288. Its totient is φ = 7776.

The previous prime is 25423. The next prime is 25439. The reversal of 25428 is 82452.

Added to its reverse (82452) it gives a triangular number (107880 = T₄₆₄).

It is a Smith number, since the sum of its digits (21) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 25428.

It is not an unprimeable number, because it can be changed into a prime (25423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75 + ... + 237.

2²⁵⁴²⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32144).

25428 is an abundant number, since it is smaller than the sum of its proper divisors (38860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25428 is a wasteful number, since it uses less digits than its factorization.

25428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183 (or 181 counting only the distinct ones).

The product of its digits is 640, while the sum is 21.

The square root of 25428 is about 159.4615941222. The cubic root of 25428 is about 29.4060980455.

Adding to 25428 its reverse (82452), we get a triangular number (107880 = T₄₆₄).

It can be divided in two parts, 254 and 28, that added together give a palindrome (282).

The spelling of 25428 in words is "twenty-five thousand, four hundred twenty-eight".