25463440 has 40 divisors (see below), whose sum is σ = 60049728. Its totient is φ = 10039680.

The previous prime is 25463429. The next prime is 25463441. The reversal of 25463440 is 4436452.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 25463399 and 25463408.

It is not an unprimeable number, because it can be changed into a prime (25463441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3439 + ... + 7921.

Almost surely, 2^25463440 is an apocalyptic number.

25463440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25463440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30024864).

25463440 is an abundant number, since it is smaller than the sum of its proper divisors (34586288).

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

25463440 is a wasteful number, since it uses less digits than its factorization.

25463440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4567 (or 4561 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 25463440 is about 5046.1311913188. The cubic root of 25463440 is about 294.1975318066.

Adding to 25463440 its reverse (4436452), we get a palindrome (29899892).

The spelling of 25463440 in words is "twenty-five million, four hundred sixty-three thousand, four hundred forty".