25445440 has 56 divisors (see below), whose sum is σ = 61155072. Its totient is φ = 10083840.

The previous prime is 25445437. The next prime is 25445443. The reversal of 25445440 is 4454452.

It is an interprime number because it is at equal distance from previous prime (25445437) and next prime (25445443).

It is a junction number, because it is equal to n+sod(n) for n = 25445399 and 25445408.

It is not an unprimeable number, because it can be changed into a prime (25445443) 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, 41617 + ... + 42223.

Almost surely, 2^25445440 is an apocalyptic number.

25445440 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 25445440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30577536).

25445440 is an abundant number, since it is smaller than the sum of its proper divisors (35709632).

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

25445440 is a wasteful number, since it uses less digits than its factorization.

25445440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755 (or 745 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 28.

The square root of 25445440 is about 5044.3473314196. The cubic root of 25445440 is about 294.1281931277.

Adding to 25445440 its reverse (4454452), we get a palindrome (29899892).

The spelling of 25445440 in words is "twenty-five million, four hundred forty-five thousand, four hundred forty".